Which of the following is the best example of an isolated system?

A. A bus at a bus station
B. An astronaut in a spaceship
C. A motorcycle in a garage
D. A car on the freeway

Answer:

ΔHacetone = - 247.5 kJ/mol

Explanation:

The enthalpy equation is as follows

ΣnΔHproducts – ΣmΔHreactants =ΔHreaction

3×ΣnΔH(CO2(g)) + 3×ΣnΔH(H2O) - ΣnΔH (C3H6O(l)) =ΔHreaction = -1790 kJ/mol

[3(-393.5) + 3(-285.8)] – ΔHacetone

= -1790 kJ/mol

(-1180.5 – 857.4)kJ/mol - ΔHacetone =

-1790 kJ/mol

-2037.9 kJ/mol - ΔHacetone

= -1790kJ/mol

-2037.9 kJ/mol + 1790kJ/mol = ΔHacetone

- 247.5 kJ/mol = ΔHacetone

ΔHacetone = - 247.5 kJ/mol

To determine the standard enthalpy of formation of acetone (C3H6O), we can use the combustion reaction equation and the standard enthalpies of formation of other compounds involved. By applying Hess's Law and the enthalpy change of the reaction, we can calculate the standard enthalpy of formation.

The standard enthalpy of formation of acetone (C3H6O) can be calculated using the given equation for the combustion of acetone and the standard enthalpies of formation of O2(g), CO2(g), and H2O(l). For the combustion reaction:

C3H6O(l) + 4O2(g) → 3CO2(g) + 3H2O(l)

The enthalpy change or ΔH of the reaction is -1790 kJ. Using Hess's Law and the enthalpy change, we can determine the standard enthalpy of formation of acetone.

We can set up an equation using the standard enthalpy of formation values:

ΔH = Σ(ΔHf(products)) - Σ(ΔHf(reactants))

By rearranging the equation, we can solve for the standard enthalpy of formation of acetone.

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Answer:

0.15 m C6H12O6 > 0.15 m CH3COOH > 0.10 m Na3PO4 >  0.20 m MgCl2 > 0.35 m NaCl

Explanation:

Step 1:

0.10m Na3PO4

Na3PO4 → 3Na+ + PO4^-3-

⇒ van't Hoff factor is 3 + 1 = 4

0.10 m * 4 = 0.40

0.35m NaCl

NaCl → Na+ + Cl-

⇒ van't Hoff factor = 1+1 = 2

0.35 * 2 = 0.70

0.20m MgCl2

MgCl2 → Mg^2+ + 2Cl-

 ⇒ Van't Hoff factor = 1+2 = 3

0.20 * 3 = 0.60

0.15m C6H12O6

⇒  for non-ionic compounds in solution, like glucose (C6H12O6) , the van't Hoff factor is 1. They do not dissociate in water.

0.15 * 1 = 0.15

0.15m CH3COOH.

CH3CO2H ⇄ CH3CO2− + H+

 ⇒ Van't hoff factor ≈ 1<x<2

0.15 * 2 = 0.30

Larger the concentration of the concentration of the particles, smaller the freezing point.

0.15 m C6H12O6 > 0.15 m CH3COOH > 0.10 m Na3PO4 >  0.20 m MgCl2 > 0.35 m NaCl

The order of decreasing freezing point is -

0.15m C6H12O6 < 0.15m CH3COOH < 0.10 m Na3PO4 < 0.20 m MgCl2 < 0.35 m NaCl,

It is calculated as:  

dT = i Kf m  

m = The concentration values in molalities  

Kf = the cryoscopic constant for water (-1.86, the same for all solutions)

i = the Van’t Hoff factor, which is the number of ion particles per individual molecule/formula of solute

Solution:

So you have to arrange in increasing order of the product i·m  

0.15 m C6H12O6        

im = 1 x 0.15 = 0.15     (undissociated, i=1)

0.15 m CH3COOH  

im =1.1 x 0.15 = 0.17 (partially dissociated) ( 1<i<2)

0.10 m Na3PO4

im = 4 x 0.1 = 0.4       (i=4)

0.20 m MgCl2

im = 3 x 0.2 = 0.6    (i=3)

0.35 m NaCl,

im = 2 x 0.35 = 0.7 (i=2)

Thus, the order of decreasing freezing point is -

0.15m C6H12O6 < 0.15m CH3COOH < 0.10 m Na3PO4 < 0.20 m MgCl2 < 0.35 m NaCl,

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Answer: To determine the average atomic mass, we require abundance of every isotope in the nature.

Explanation:

Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

[tex]\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i[/tex]

For Example: There are 3 isotopes of silicon, Si-28, Si-29 and Si-30.

We know that:

Average atomic mass of silicon = 28.086 amu

In order to calculate the average atomic mass of an element, we need the atomic mass of every isotope and also the abundance of every isotope in the nature.

Percentage abundance of Si-28 isotope = 92.2 %

Percentage abundance of Si-29 isotope = 4.7 %

Percentage abundance of Si-30 isotope = 3.1 %

Hence, to determine the average atomic mass, we require abundance of every isotope in the nature.

Answer: The molecular formula of the compound is [tex]C_3H_{12}O_3[/tex]

Explanation:

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of C = 37.5 g

Mass of H = 12.5 g

Mass of O = 50.0 g

Step 1 : convert given masses into moles.

Moles of C =[tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{37.5g}{12g/mole}=3.125moles[/tex]

Moles of H = [tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{12.5g}{1g/mole}=12.5moles[/tex]

Moles of O = [tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{50.0g}{16g/mole}=3.125moles[/tex]

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C =[tex]\frac{3.125}{3.125}=1[/tex]

For H= [tex]\frac{12.5}{3.125}=4[/tex]

For O =[tex]\frac{3.125}{3.125}=1[/tex]

The ratio of C: H: O = 1: 4: 1

Hence the empirical formula is [tex]CH_4O[/tex].

The empirical weight of [tex]CH_4O[/tex] = 1(12)+4(1)+1(16)= 32g.

The molecular weight = 93.0 g/mole

Now we have to calculate the molecular formula.

[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{93}{32}=3[/tex]

The molecular formula will be=[tex]3\times CH_4O=C_3H_{12}O_3[/tex]

The molecular formula of the compound is C3H12O3. This was determined by converting percent composition to grams, then to moles to find a simplest ratio for the empirical formula and comparing its mass with the molecular mass.

The compound could firstly be analyzed into its empirical formula by treating the percentage composition directly as masses, which would then provide us the simplest ratio of elements. Hence for 37.5g of C we have 37.5/12.01 = ~3.1 moles of C, for 12.5g of H we have 12.5/1.01 = ~12.4 moles of H, and for 50.0g of O we have 50.0/16.00 = ~3.1 moles of O. The simplest ratio (empirical formula) will then be C3H12O3, with empirical formula mass equals to 94.1 g/mol. This mass is very close to the mentioned molecular mass of 93.0 g/mol, so our molecular formula is presumably the same as the empirical formula. Therefore, the molecular formula of the compound is C3H12O3.

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Answer:

in the presence of water H2O

Na2CO3 (S) --> 2Na+ (aq)+ (CO3)2-(aq)

One mole of sodium carbonate produces two moles of Na+ ions

Therefore 0.207 moles produces 0.414 moles of Na+ ions

= 0.414 moles of Na+ ions

Explanation:

In water

Na2CO3 --> 2Na+ (aq)+ (CO3)2-(aq)

In a limited reaction, the carbonate ion reacts with the water molecules as follows

(CO3)2-(aq) + H2O←→HCO3-(aq) + OH-(aq)

sodium carbonate or soda ash dissolves in water to give 2 sodium cations and one carbonate anion

The balanced equation for the dissolution of sodium carbonate in water produces two moles of Na+ for every mole of Na2CO3. For 0.207 mol of sodium carbonate, it yields 0.414 mol of Na+ ions.

The balanced equation for the dissolution of sodium carbonate (Na2CO3) in water is:

Na2CO3(s) → 2Na+(aq) + CO3^2-(aq)

When 0.207 mol of sodium carbonate dissolves in water, it produces two moles of Na+ ions for every mole of sodium carbonate. Therefore, to find the number of moles of Na+ produced we multiply:

0.207 mol Na2CO3 × 2 mol Na+ / 1 mol Na2CO3 = 0.414 mol Na+

Final answer:

Other cation channels, such as voltage-gated calcium and potassium channels, can substitute for the function of blocked voltage-gated sodium channels in action potential generation and propagation.

Explanation:

If the voltage-gated sodium channels are blocked, other cation channels can substitute for their function in action potential generation and propagation. One such cation channel is the voltage-gated calcium channel. Although calcium channels primarily play a role in synaptic transmission, they can also contribute to the depolarization phase of the action potential in the absence of functional sodium channels.

Another cation channel that can substitute for voltage-gated sodium channels is the voltage-gated potassium channel. While potassium channels primarily repolarize the membrane during the action potential, they can also contribute to the depolarization phase in the absence of sodium channels.

It is important to note that these cation channels may not fully replicate the function of voltage-gated sodium channels, and the exact impact on action potential generation and propagation can vary depending on the specific circumstances.

Answer:

1. Catalyst

2. Solution

3. Solute

4. Solvent

Explanation:

1. A catalyst increases reaction rate but is not used up or consumed in the reaction

Example of a catalyst found in nature are Enzymes

2. Solution, an homogeneous mixture of two or more substances solutes and solvents

3. Solute, the component of a solution dissolved in the solvent

4. Solvent, the component of a solution that dissolves the solute

Answer:

c.

Explanation:

A serial dilution is a dilution that is made fractionated. The stock solution is diluted, then this now solution is diluted, and then successively. The final dilution is the multiplication of the steps dilutions.

The representation of the dilution is v/v (volume per volume) indicates how much of the stock solution is in the total volume of the solution. So 1/5 indicates 1 mL to 5 mL of the solution. If the final volume must be 1 mL, then the stock solution must be 0.2 mL (0.2/1 = 1/5), and the volume of the solvent is 1 mL - 0.2 = 0.8 mL.

The second solution is done with a dilution of 1/10 or 1 mL of the first solution in 10 mL of the total solution. Because the solution has 1 mL, then the volume of the first solution must be 0.1 mL (0.1/1 = 1/10), and the volume of the solvent that must be added is 1 mL - 0.1 mL = 0.9 mL.

Answer:

Option B

Explanation:

As nitrogen is more electronegative than hydrogen atom, it attracts the electronic cloud towards it center. This results in poles formation that is partial positive charge on hydrogen and partial negative charge on hydrogen atom. Hence, it makes polar polar covalent bond.

The statement which best explain why the bonds in ammonia is polar covalent is " nitrogen has greater electronegativity than hydrogen. Thus option C is correct.

Electronegativity is ability of an atom to attracts bonded pair electrons towards it. The atoms which can acquire stability by accepting one ore more electrons are electronegative.

Nitrogen is an electronegative atom and its valency is 3 means it needs 3 more electron to attain stability. Thus nitrogen is able to attracts the shared electron from hydrogen and forms a partial negative charge.

Hydrogen is an electropositive atom and it forms a partial positive charge by releasing the shared electron towards nitrogen. This charge separation creates there a polarity. That's the bond type is called polar covalent.

Hence, the bond type in ammonia is polar covalent due to the higher electronegativity of nitrogen than hydrogen.

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In the molecule ammonia (NH3), each hydrogen atom has a partial positive charge and the nitrogen atom has a partial negative charge. There are covalent bonds between the hydrogen atoms.

In the molecule ammonia (NH3), each hydrogen atom has a partial positive charge (A) because nitrogen is more electronegative than hydrogen. The nitrogen atom, on the other hand, has a partial negative charge (D) due to the uneven distribution of electrons. The presence of covalent bonds between nitrogen and hydrogen atoms (E) results in the formation of ammonia.

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Answer:

The coefficient of Ca(OH)2 is 1

Explanation:

Step 1: unbalanced equation

Ca(OH)2 + HNO3 → Ca(NO3)2 + H2O

Step 2: Balancing the equation

On the right side we have 2x N (in Ca(NO3)2 ) and 1x N on the left side (in HNO3). To balance the amount of N on both sides, we have to multiply HNO3 by 2.

Ca(OH)2 + 2HNO3 → Ca(NO3)2 + H2O

On the left side we have 4x H (2xH in Ca(OH)2 and 2x H in HNO3), on the right side we have 2x H (in H2O). To balance the amount of H on both sides, we have to multiply H2O on the right side, by 2.

Now the equationis balanced.

Ca(OH)2 + 2HNO3 = Ca(NO3)2 + 2H2O

The coefficient of Ca(OH)2 is 1

Final answer:

The coefficient of Ca(OH)2 is 1.

Explanation:

The coefficient of Ca(OH)2 in the equation Ca(OH)2 + HNO3 → Ca(NO3)2 + H2O when balanced using the smallest possible coefficients is 1.

Answer:

Explanation:

Light:

Solar Energy, Storage of Energy, Release of O2, & ATP

Dark:

CO2 Intake, Release of Energy, Release of Water, & Forms Carbohydrates.

Hope this helps!

Final answer:

In photosynthesis, solar energy is utilized during the light phase to produce ATP and release O₂, while the Calvin cycle (dark phase) involves CO₂ intake and the formation of energy-storing carbohydrates.

Explanation:

Photosynthesis consists of two main phases: the light reactions and the Calvin cycle (often referred to as the 'dark' phase). Here is the association of the given elements to each phase:

Light Phase Associations

Dark Phase (Calvin cycle) Associations

These associations help the processes involved in photosynthesis, where light energy is captured to produce ATP and NADPH, and then used along with CO₂ in the Calvin cycle to produce energy-storing carbohydrates, with O₂ released as a by-product.

Answer:

3284.3 kg is the mass of HCl needed to produce 5000 kg of CaCl₂

Explanation:

This is the reaction:

CaCO₃ + 2HCl →  CaCl₂  +  CO₂  +  H₂O

Let's convert the mass of the product to moles (mass (g) / molar mas)

Firstly we must convert kg to g

1 kg = 1000 g

5×10³ kg . 1000 g / 1 kg = 5×10⁶ g

5×10⁶ g / 110.98 g/mol = 45053.1 moles

Ratio is 1:2 So, let's make a rule of three:

1 mol of CaCl₂ was produced by the use of 2 moles of HCl

So 45053.1 moles of salt, were produced by, the double of moles

45053.1 mol . 2 → 90106.2 moles

Let's convert the moles, to mass (mol . molar mass)

90106.2 mol . 36.45 g/mol = 3284375 g → 3284.3 kg

Answer : The diatomic gas is nitrogen gas, N₂.

Explanation :

First we have to calculate the moles of gas.

Using ideal gas equation:

[tex]PV=nRT[/tex]

where,

P = Pressure of gas = 1.00 atm

V = Volume of gas = 4.4 L

n = number of moles of gas = ?

R = Gas constant = [tex]0.0821L.atm/mol.K[/tex]

T = Temperature of gas = [tex]22.0^oC=273+22.0=295.0K[/tex]

Putting values in above equation, we get:

[tex]1.00atm\times 4.4L=n\times (0.0821L.atm/mol.K)\times 295.0K[/tex]

[tex]n=0.1817mol[/tex]

Now we have to calculate the molar mass of gas.

[tex]\text{Molar mass of gas}=\frac{\text{Given mass of gas}}{\text{Moles of gas}}[/tex]

[tex]\text{Molar mass of gas}=\frac{5.1g}{0.1817mol}=28.07g/mol[/tex]

As we are given that the gas is diatomic X₂.

As, 2 atoms of gas X has mass = 28.07 g/mol

So, 1 atom of gas will have mass = [tex]\frac{28.07}{2}=14.04g/mol[/tex]

From this we conclude that the nitrogen atom has mass of 14.04 g/mol.

Thus, the diatomic gas is nitrogen gas, N₂.

Answer: Option A. oxygen, carbon dioxide, nitrogen

Explanation:

Answer:

The answer has been provided in the attachment

Explanation:

The step by step explanation is as given in the attachment below.

The dissolution reactions for Mn(ClO4)2 and Li2CO3 are Mn(ClO4)2(s) -> Mn2+(aq) + 2ClO4-(aq) and Li2CO3(s) -> 2Li+(aq) + CO3^2-(aq) respectively. The cations Mn^2+ and Li+ will react with the anions ClO4^- and CO3^2- respectively to form a precipitate. The net precipitation reaction is Mn2+(aq) + 2ClO4-(aq) + 2Li+(aq) + CO3^2-(aq) -> Mn(ClO4)2(s) + Li2CO3(s).

(A) The dissolution reaction for Mn(ClO4)2 is:

Mn(ClO4)2(s)  →  Mn2+(aq) + 2ClO4-(aq)

(B) The dissolution reaction for Li2CO3 is:

Li2CO3(s)  →  2Li+(aq) + CO32-(aq)

(C) Based on the lab results and the solutions, a precipitate will form when the cations Mn2+ and Li+ react with the anions ClO4- and CO32- respectively.

(D) The net precipitation reaction that occurs is:

Mn2+(aq) + 2ClO4-(aq) + 2Li+(aq) + CO32-(aq)  →  Mn(ClO4)2(s) + Li2CO3(s)

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Answer:

103.9 kPa

Explanation:

It's more easy to convert mmHg to Pa and then /1000

Let's try the rule of three:

760 mmHg  is 101325 Pa

780 mmHg (780 mmHg . 101325 Pa) / 760mmHg = 103991.4 Pa

1 kPa = 1000 Pa

103991.4 Pa / 1000 = 103.9 kPa

Answer:

c) .51835

Explanation:

Let the relative abundance of the lighter of the two isotopes be X we have

Then the relative abundance of the heavier isotope is then (1-X)

Whereby we have that in nature the amount of the lighter silver found in proportion is X and the heavier isotope of silver is present as (1-X) proportion in nature.

To calculate the relative atomic mass of silver, we have

(Mass of light weight silver)×X + (mass of heavier isotope of silver×(1-X) = relative atomic mass of silver

106.90509(X) + 108.9047(1-X)

108.9-108.9(x)+106.9(x) = 107.87

-2x-1.03 = 0.517450902926

Closest answer is c

c) .5184

The relative atomic mass of isotopes is the weighted average by the mole-fraction of abundance of these isotopes which gives the atomic weight that is listed for that element on the periodic table.

The mass of oxygen reacted with 14 g nitrogen has been 16 grams.

The formation of dinitrogen dioxide has been mediated with the reaction of oxygen with nitrogen.

The mass of oxygen required for the reaction has been given with the balanced chemical equation as:

[tex]\rm N_2\;+\;O_2\;\rightarrow\;N_2O_2[/tex]

Thus, for the reaction with 1 mole of oxygen, 1 mole of nitrogen has been required.

The mass of 1 mole oxygen has been 32 g.

The mass of 1 mole nitrogen has been 28 g.

Thus, for the reaction with 14 g nitrogen, the mass of oxygen required has been:

[tex]\rm 28\g\;N_2=32\;g\;O_2\\14\;g\;N_2=\dfrac{32}{28}\;\times\;14\g\;O_2\\14\;g\;N_2=165\;g\;O_2[/tex]

The mass of oxygen reacted with 14 g nitrogen has been 16 grams.

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The mass of oxygen required to react with 14 g of nitrogen to make [tex]N_2O_5[/tex] is 80 g.

The balanced chemical equation for the formation of [tex]N_2O_5[/tex] from nitrogen [tex](N_2)[/tex] and oxygen [tex](O_2)[/tex] is:

[tex]\[ N_2 + 5O_2 \rightarrow 2N_2O_5 \][/tex]

The balanced chemical equation for the formation of [tex]N_2O_2[/tex] from nitrogen [tex](N_2)[/tex] and oxygen [tex](O_2)[/tex] is:

[tex]\[ N_2 + 2O_2 \rightarrow 2N_2O_2 \][/tex]

From the second equation, we can see that 16 g of oxygen reacts with 14 g of nitrogen to form [tex]N_2O_2[/tex]. This gives us the molar ratio of oxygen to nitrogen for [tex]N_2O_2[/tex], which is 2:1 by mass.

Now, we need to find out the molar ratio of oxygen to nitrogen for [tex]N_2O_5[/tex]. From the first equation, the molar ratio of oxygen to nitrogen is 5:1.

Since the mass of nitrogen (14 g) is the same in both reactions, we can directly compare the ratios of oxygen used in both reactions.

For [tex]N_2O_2[/tex], we have 16 g of oxygen for every 14 g of nitrogen, and for [tex]N_2O_5[/tex], we need 5 times as much oxygen for the same amount of nitrogen.

Therefore, the mass of oxygen required for [tex]N_2O_5[/tex] is:

[tex]\[ \frac{5}{2} \times 16 \text{ g of oxygen} = 40 \text{ g of oxygen} \][/tex]

Using the molar masses of nitrogen (14 g/mol for [tex]N_2[/tex]) and oxygen (32 g/mol for [tex]O_2[/tex]), we can calculate the amount of oxygen needed:

[tex]\[ \frac{14 \text{ g of N2}}{28 \text{ g/mol of N2}} \times \frac{5 \text{ mol of O2}}{1 \text{ mol of N2}} \times 32 \text{ g/mol of O2} = 80 \text{ g of O2} \][/tex]

Answer: The concentration of [tex]Cl^-[/tex] ions in the resulting solution is 1.16 M.

Explanation:

To calculate the molarity of the solution after mixing 2 solutions, we use the equation:

[tex]M=\frac{n_1M_1V_1+n_2M_2V_2}{V_1+V_2}[/tex]

where,

[tex]n_1,M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of the [tex]CaCl_2[/tex]

[tex]n_2,M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of the [tex]AlCl_3[/tex]

We are given:

[tex]n_1=2\\M_1=0.276M\\V_1=155mL\\n_2=3\\M_2=0.471M\\V_2=384mL[/tex]  

Putting all the values in above equation, we get

[tex]M=\frac{(2\times 0.276\times 155)+(3\times 0.471\times 384)}{155+384}\\\\M=1.16M[/tex]

The concentration of [tex]Cl^-[/tex] ions in the resulting solution will be same as the molarity of solution which is 1.16 M.

Hence, the concentration of [tex]Cl^-[/tex] ions in the resulting solution is 1.16 M.

The molarity of Cl¯ in the solution made by mixing 155 mL of 0.276 M CaCl₂ with 384 mL of 0.471 M AlCl₃ is 1.165 M

We'll begin by calculating the number of mole of chloride ion, Cl¯ in each solution.

Volume = 155 mL = 155 / 1000 = 0.155 L

Molarity = 0.276 M

Mole = Molarity x Volume

Mole of CaCl₂ = 0.276 × 0.155

CaCl₂(aq) —> Ca²⁺(aq) + 2Cl¯(aq)

From the balanced equation above,

1 mole of CaCl₂ contains 2 moles of Cl¯

Therefore,

0.04278 mole of CaCl₂ will contain = 0.04278 × 2 = 0.08556 mole of Cl¯

Thus, 0.08556 mole of Cl¯ is present in 155 mL of 0.276 M of CaCl₂.

Volume = 384 mL = 384 / 1000 = 0.384 L

Molarity = 0.471 M

Mole = Molarity x Volume

Mole of AlCl₃ = 0.471 × 0.384

AlCl₃(aq) —> Al³⁺(aq) + 3Cl¯(aq)

From the balanced equation above,

1 mole of AlCl₃ contains 3 moles of Cl¯

Therefore,

0.180864 mole of AlCl₃ will contain = 0.180864 × 3 = 0.542592 mole of Cl¯

Thus, 0.542592 mole of Cl¯ is present in 384 ml of 0.471 M of AlCl₃

Mole of Cl¯ in CaCl₂ = 0.08556 mole

Mole of Cl¯ in AlCl₃ = 0.542592

Total mole = 0.08556 + 0.542592

Volume of CaCl₂ = 0.155 L

Volume of AlCl₃ = 0.384 L

Total volume = 0.155 + 0.384

Total mole = 0.628152 mole

Total volume = 0.539 L

Molarity = mole / Volume

Molarity of Cl¯ = 0.628152 / 0.539

Therefore, the molarity of Cl¯ in the resulting solution is 1.165 M

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Answer:

The answer to your question is 8.28 g of glucose

Explanation:

Data

Glucose  (C₆H₁₂O₆) = ?

Ethanol (CH₃CH₂OH)

Carbon dioxide (CO₂) = 2.25 l

Pressure = 1 atm

T = 295°K

Reaction

                             C₆H₁₂O₆    ⇒    2C₂H₅OH(l) +2CO₂(g)

- Calculate the number of moles

                             PV = nRT

Solve for n

                             [tex]n = \frac{PV}{RT}[/tex]

Substitution

                             [tex]n = \frac{(1)(2.25)}{(0.082)(295)}[/tex]

Simplification

                            n = 0.092

- Calculate the mass of glucose

                         1 mol of glucose --------------- 2 moles of carbon dioxide

                          x                         --------------- 0.092 moles

                          x = (0.092 x 1) / 2

                          x = 0.046 moles of glucose

Molecular weight of glucose = 180 g

                       180 g of glucose ---------------  1 mol

                         x  g                    ---------------0.046 moles

                         x = (0.046 x 180) / 1

                         x = 8.28 g of glucose                                    

Answer:

Mass of AgI formed=0.352g

Explanation:

AgNO3 + NaI ----‐>AgI + NaNO3

Volume of AgNO3 =5g/L

Mass of AgNO3 =C×V=0.25g

n(AgNO3)= m/Mr=0.0015mol

For NaI

V= 5g/l

Mass= C×v=0.25g

n=m/Mr=0.0017mol

n=0.0015mol

Mass=n× mr=0.352g

From the stoichiometry of the reaction, 0.45 g of AgI is formed.

First of all we have to obtain the molar concentration of AgNO3 using the formula;

Mass concentration = molar concentration × molar mass

Molar concentration = Mass concentration /molar mass

Molar concentration = 5.00 g/L/170 g/mol = 0.029 M

Number of moles of AgNO3  = molar concentration × volume

=  0.029 M  × 56.6/1000 L= 0.0016 moles

Molar concentration of NaI =  5.00 g/L /150 g/mol = 0.033 M

Number of moles of NaI = 0.033 M  × 56.6/1000 L = 0.0019 moles

The reaction equation is;

AgNO3 + NaI -----> AgI + NaNO3

Since the reaction is 1:1 then AgNO3 is the limiting reactant.

Mass of AgI formed = 0.0016 moles  × 235 g/mol = 0.45 g

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Answer:

The answer to your question is   C₃H₃O

Explanation:

Data

Combustion of a compound C, H, O

mass = 6.10 g

mass CO2 = 14.9 g

mass of water = 6.10 g

Reaction

                     Cx Hy Oz   +   O2   ⇒     CO2   +   H2O

Process

1.- Calculate the moles of carbon

                          44 g of CO2   --------------  12 g of carbon

                           14.9 g of CO2 -------------   x

                            x = (14.9 x 12) / 44

                            x = 4.06 g

                          12 g of C    ------------------ 1 mol

                          4.06 g       ------------------- x

                          x = (4.06 x 1) / 12

                          x = 0.34 moles

2.- Calculate the moles of hydrogen

                           18 g of water -------------  1 g of hydrogen

                            6.10 g of water ----------   x

                            x = (6.10 x 1) / 18

                            x = 0.33 g

                           1 g of H  ----------------  1 mol of H

                           0.33 g     ----------------  x

                           x = (0.33 x 1) / 1

                           x = 0.33 moles of H

3.- Calculate the mass of oxygen

mass of Oxygen = 6.10 - 4.06 - 0.33

                            = 1.71 g

                          16 g of O ---------------  1 mol of O

                          1.71 g of O -------------   x

                          x = (1.71 x 1) / 16

                          x = 0.11 moles

4.- Divide by the lowest number of moles

Carbon   = 0.34 / 0.11  = 3                          

Hydrogen = 0.33 / 0.11 = 3

Oxygen = 0.11 /0.11 = 1

5.- Write the empirical formula

                                    C₃H₃O

Answer:

131.2 mL would be the total volume in the graduated cylinder.

Explanation:

Let's work with the density of metal to find out its volume

Metal density = Metal mass / metal volume

4.46 g/mL = 22.25 g / metal volume

Metal volume = 22.25 g / 4.46 g/mL = 4.98 mL

If we suppose aditive volume, total volume in the graduated cylinder will be:

126.3mL + 4.9mL =  131.2 mL

Answer : The concentration of SO₃ in the vessel 0.240 seconds later is, 0.24 M

Explanation :

The expression used for second order kinetics is:

[tex]kt=\frac{1}{[A_t]}-\frac{1}{[A_o]}[/tex]

where,

k = rate constant = [tex]14.1M^{-1}s^{-1}[/tex]

t = time = 0.240 s

[tex][A_t][/tex] = final concentration = ?

[tex][A_o][/tex] = initial concentration = 1.44 M

Now put all the given values in the above expression, we get:

[tex]14.1\times 0.240=\frac{1}{[A_t]}-\frac{1}{1.44}[/tex]

[tex][A_]t=0.24M[/tex]

Therefore, the concentration of SO₃ in the vessel 0.240 seconds later is, 0.24 M

Answer:

6049.69 g or 6.04969 Kg of ore must be processed to get 1 Kg of phosphorous.

Explanation:

Given

An ore has 51% Calcium phosphate

To find

The minimum mass of ore to be processed to get 1.00 Kg of phosphorous

First find the mass of phosphorous in 1 mole = molar mass of Calcium phosphate, Ca₃(PO₄)₃.

Molar mass  of Ca₃(PO₄)₃ is 310 g

Molar mass  of  P is 31 g

1 mole of Ca₃(PO₄)₃ has 3 atoms of phosphorous

i.e 310 g of  Ca₃(PO₄)₃ has 3× 31g of P

= 93 g P

93 g P wil be present in 310 g of Ca₃(PO₄)₃  

1 Kg or 1000 g of P will be in   (1000÷93) ×310

=3333.33 g of Ca₃(PO₄)₃

but the ore has only 55.1% Ca₃(PO₄)₃

i.e

100 g of Ca₃(PO₄)₃ will have 55.1g Ca₃(PO₄)₃

we need 3333.33g of Ca₃(PO₄)₃

100 g of ore  will have 55.1g Ca₃(PO₄)₃

3333.33g of Ca₃(PO₄)₃ will be present in

(3333.33÷ 55.1) ×100

= 6049.60 g of the ore

So 6049.69 g or 6.04969 Kg of ore must be processed to get 1 Kg of phosphorous.

Answer: metabolic acidosis.

Explanation:

Anion Gap(AG) is the difference between positively charged ions and negatively charged ions. It is usually expressed in milliequivalents per litre of millimoles per litres.

Anion Gap is measured or calculated when there is a need to know the cause of metabolic acidosis. To

Anion Gap can be calculated with or without potassium.

(1). With potassium= ([Na^+] + [K^+]) − ([Cl^−] + [HCO^−3]).

From the question; client's lab values are sodium 166 mEq/L, potassium 5.0 mEq/L, chloride 115 mEq/L, and bicarbonate 35 mEq/L.

Slotting in the values, we have;

==>[ (166+5) - (115+35)] mEq/L.

(2). Without potassium:

==> [Na^+] - ([Cl^−] + [HCO^−3]).

==> [(166) - 115 + (35)] mEq/L

Normal Anion gap is 20 mEq/L(Calculating with Potassium) and 8-16 mEq/L (calculating without potassium).

Answer: Beliefs

Explanation: This is a fundamental definition in sociology; the study of society, human social interaction and the rules and processes that bind and separate people not only as individuals, but as members of associations, groups and institutions.

Beliefs are ordinarily defined as the mental acceptance or conviction that certain things are true, real or just the way they are.

Beliefs are a central component of nonmaterial culture, influencing behaviors, values, and norms in a society.

A central component of nonmaterial culture is beliefs, which are the mental acceptance or conviction that certain things are true or real.  These beliefs can vary widely from one culture to another and can shape behaviors, values, and norms within a society. For example, in some cultures, the belief in an afterlife may lead to specific burial rituals, while in other cultures, the belief in a strict diet may shape what foods are considered acceptable or taboo.

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Beliefs are a central component of nonmaterial culture, representing the mental acceptance or conviction that certain things are true or real. They set the foundation for individuals' perception of the world and guide their behaviors.

A central component of nonmaterial culture is beliefs, which are the mental acceptance or conviction that certain things are true or real. Nonmaterial culture refers to the intangible aspects of a society, including its values, norms, and ideologies. These beliefs form the foundation of how individuals perceive and interact with the world, guiding behaviors and influencing societal standards. For example, the belief in equality may cultivate a culture of fairness and non-discrimination in a society.

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Answer:

Rock

Explanation:

Rock -

It refers to the substance composed of minerals which occurs naturally , is referred to as a rock.

Rocks are basically found in the outermost layer of the Earth i.e. , the crust .

There are three major type of rock known, i.e. , sedimentary rocks , metamorphic rocks and igneous rocks .

Hence, from the given information of the question,

The correct answer is rock.

A rock is a solid, naturally occurring, cohesive substance composed of minerals or mineral-like materials. Examples include granite which comprises various minerals. Rocks are classified into three types: igneous, sedimentary, and metamorphic.

A rock is a solid, naturally occurring, cohesive substance composed of minerals or mineral-like materials. For instance, granite is a common form of rock that comprises several minerals including feldspar, mica, and quartz. Rocks can be classified into three main types: igneous, sedimentary, and metamorphic, each type formed under different geological conditions and processes.

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Answer:

T° freezing solution → -11.3°C

T° boiling solution → 103.1 °C

Explanation:

Assuming 100 % dissociation, we must find the i, Van't Hoff factor which means "the ions that are dissolved in solution"

This salt dissociates as this:

SnCl₄ (aq)  →   1Sn⁴⁺ (aq)  +   4Cl⁻  (aq)   (so i =5)

The formula for the colligative property of freezing point depression and boiling point elevation are:

ΔT = Kf . m . i

where ΔT = T° freezing pure solvent - T° freezing solution

ΔT = Kb . m . i

where ΔT = T° boiling solution - T° boiling pure solvent

Freezing point depression:

0° - T° freezing solution = 1.86°C/m . 1.22 m . 5

T° freezing solution = - (1.86°C/m . 1.22 m . 5) → -11.3°C

Boiling point elevation:

T° boiling solution - 100°C = 0.512 °C/m . 1.22 m . 5

T° boiling solution = (0.512 °C/m . 1.22 m . 5) + 100°C → 103.1 °C