Answer:
165.726 g.
Explanation:
For the balanced equation:Cr₂O₃ + 3H₂S → Cr₂S₃ + 3H₂O,
It is clear that 1 mol of Cr₂O₃ and 3 mol of H₂S to produce 1 mol of Cr₂S₃ and 3 mol of H₂O.
Firstly, we need to calculate the no. of moles of 324.8 g of chromium(III) sulphide:no. of moles of Cr₂S₃ = mass/molar mass = (324.8 g)/(200.19 g/mol) = 1.62 mol.
Now, we can find the "no. of grams" of H₂S are needed:
Using cross multiplication:
3 mol of H₂S produces → 1 mol of Cr₂S₃, from stichiometry.
??? mol of H₂S produces → 1.62 mol of Cr₂S₃.
∴ The no. of moles of H₂S are needed = (3 mol)(1.62 mol)/(1 mol) = 4.86 mol.
∴ The "no. of grams" of H₂S are needed = (no. of moles of H₂S)(molar mass of H₂S) = (4.86 mol)(34.1 g/mol) = 165.726 g.
What type of reaction is represented by the following example? 2CO2 (g) + 4H2O (l) + 1452 kJ 2CH3OH (l) (g) + 3O2 (g) exothermic endothermic
endothermic
I hope this helped :)
Answer : The given reaction is an example of endothermic reaction.
Explanation :
Endothermic reaction : It is a type of chemical reaction in which the energy is absorbed by the surroundings. In this reaction, the energy of reactants are less than the energy of products. In this reaction, the energy is given to the system.
Exothermic reaction : It is a type of chemical reaction in which the energy is released into the surroundings. In this reaction, the energy of reactants are more than the energy of products. In this reaction, the energy is released from the system.
The given balanced chemical reaction is,
[tex]2CO_2(g)+4H_2O(l)+1452KJ\rightarrow 2CH_3OH(l)+3O_2(g)[/tex]
In this reaction, the 1452 KJ energy is given to the system. So, the given reaction is an example of endothermic reaction.
Which of the following ions has a pseudo-noble-gas electron configuration?
A) Ni+
B) Fe2+
C) Cu+
D) Mn2+
Answer:A pseudo-noble gas configuration is: 1s2 2s2 2p6 3s2 3p6 3d10. Cu^+ has this electron configuration. The answer is C)
Explanation:
[tex]\bold{Cu^+}[/tex] ions have a "pseudo-noble-gas" electron configuration.
Explanation:The ion with the [tex](n-1) d^{10}[/tex] electron configuration is known as Nobel gas. The nature of noble gas is that the cations in this electron configuration are stable.
The Pseudo-noble gas has the electron configuration as:
[tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10}[/tex]
Since, [tex]Cu^+[/tex] ion has the same configuration. The example of Nobel gas is, both [tex]InCl[/tex] and [tex]InCl_3[/tex] are stable compounds. To form [tex]In^+[/tex] only the [tex]5p^1[/tex] electron is removed leaving the [tex][Kr] 5s^2 4d^{10}[/tex] electronic configuration.
How are ionic bonds and van der waals forces similar
Which of the following are acids or bases?
1. Sodium hydrogen
2. Barium hydroxide solution
3. Carbonate solution
Answer:
1. Sodium hydrogen - Base
2. Barium hydroxide solution - Acid
3. Carbonate solution - Base
Explanation:
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What happens when temperature is increased in a reaction?
Answer:
When you lower the temperature, the molecules are slower and collide less.
Explanation:
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Sugars in a polysaccharide are linked together by bonds to _____.
a nitrogen atom
a carbon atom
an oxygen atom
a sulfur atom
Answer:
It's an oxygen atom
Explanation:
How are isotopes of the same element alike?
Hello!
Isotopes are variants of an element that have a different number of neutrons. Essentially, their only different is that their weight varies from the original element.
Therefore, they are similar in that they have the same number of protons, same number of electrons, and overall, the properties (apart from weight) are the same.
Hope this helped!
when scientists say that a theory can never be proven , what are they actually saying?
Which best describes the activation energy of a chemical reaction?
A. the combined energy of all the reactants
B. the amount of energy required for a reaction to occur
C. the difference in energy between products and reactants
D. the potential energy stored in the bonds of reactants and products
The answer is B as activation energy is the least possible amount of energy (minimum) which is required to start a reaction or the amount of energy available in a chemical system for a reaction to take place.
Activation energy of a chemical reaction is the amount of energy required for a reaction to occur. Thus, option B is correct.
What is Activation energy?Different atoms, molecules, or compounds come together to form new compounds in a chemical reaction.Reactant molecules in the chemical reaction result in product molecules.‘The minimum amount of energy needed to initiate any chemical reaction is referred to as activation energy.This is due to the fact that all reactions, whether exothermic or endothermic, require some amount of energy to begin.In order to start the exothermic process, some activation energy is also required; eventually, this energy is released.The characteristics of the reactant and the presence of the catalyst can have an impact on activation energy.It’s expressed in KJ/mol.Thus, the minimum amount of energy called activation energy is required to initiate a chemical reaction.
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a student made the lewis dot diagram of a compound shown. What is the error in the Lewis dot diagram?
a)An O atom should transfer all of its six electrons to Mg because the formula is MgO
b) both electrons of Mg Should be transferred to one O Adam because the formula is MgO
c) The electrons should be transferred from each O add him to capital Mg because Mg has fewer electrons
d) The number of dots around Mg should be four because it has to transfer two electrons to each O
Answer:
B. Both electrons of Mg should be transferred to one O.
Explanation:
Metals react by loosing electrons while non metals react by gaining electrons.
Reactions occur as each element strives to attain an octet electron configuration in the outer energy level.
It is easier for magnesium to loose 2 electrons than to gain six because loosing the two requires less energy.
Oxygen on the other hand reacts by gaining the two electrons lost by magnesium since it is easier to gain the two than to loose the six. Gaining the two electrons for oxygen requires less energy than loosing the six.
In summary, magnesium looses two electrons that are transferred to oxygen.
What two factors speed up rates of chemical reaction and weathering in rocks and soils?
Answer:
Moist and warm temperatures
Explanation:
Temperature and rainfall are the two main factors that speed up chemical reactions and weathering in rocks and soils. Higher temperatures increase the rate of reactions while more rainfall means more water for chemical weathering, resulting in a higher weathering rate.
The two factors that speed up rates of chemical reaction and weathering in rocks and soils are the temperature and the amount of rainfall. A higher temperature increases the rate of chemical reactions, with the rate potentially doubling for every 10°C increase. This is because higher temperatures enhance the thermal agitation of atoms and molecules, leading to more frequent collisions and reactions. In addition, increased rainfall provides more water, an essential medium for chemical weathering reactions. More rainfall leads to more chemical reactions with the particles in soils, increasing the weathering rate.
Mechanical weathering also plays a role by breaking down rocks into smaller pieces, thus increasing the surface area available for chemical weathering. Together, mechanical and chemical weathering contribute to the deterioration of rocks and the formation of soil, which is crucial for ecosystems. The combination of climate factors, such as high temperature and heavy rainfall, typically results in nutrient-poor soils unsuitable for agriculture but rich in iron and aluminum oxides.
A change in an object's temperature will not affect the average kinetic energy of the object's particles.
TRUE
or
FALSE
Answer:true
Explanation:because its true
Complete these equations for the ionization of an Arrhenius acid or base in water. Include the states of the products.HI (aq) ----------------> __________?LiOH (s) -----------------> ________?
Calculate the molarity of an aqueous solution that is 18.2% by mass calcium chloride. You might need to know that the density is 1.18 g/ml.
Answer:
M = 1.94 mol/liter = 1.94 MExplanation:
1) Data:
a) M = ?
b) % mass = 18.2%
c) Solute: CaCl₂
d) d = 1.18 g/ml
2) Formulae:
a) Molarity
M = n/V, where M is molarity, n is number of moles of solute, and V is the volumen of solution in liters.
b) Density
d = m/V, where d is the density of the solution, m is the mass in grams, V is the volume in liters.
c) Number of moles
n = mass in grams / molar mass, where n is the number of moles.
d) % mass
% = (mass of solute / mass of solution) × 100
3) Solution:
a) Start by assuming a base amount: 100 g of solution.
b) Calcualte the volume (V) of the solution:
d = m / V ⇒ V = m / dV = 100 g / 1.18 g/ml = 84.75 ml
V = 0.08475 liter
c) Calculate the mass of solute:
% = (mass of solute / mass of solution) × 100⇒ mass of solute = % × mass of solution / 100 = 18.2 × 100 g / 100
mass of soiute = 18.2 g
d) Calculate the number of moles of solute (n)
molar mass of CaCl₂ = 110.98 g/mol g/moln =mass in grams / molar mass = 18.2 g / 110.98 g/mol = 0.164 mole) Calculate the molarity (M) of the solution
M = n / V = 0.164 mol / 0.08475 liter = 1.94 mol/liter = 1.94 MThe answer is reported with 3 significant figures, since the data have 3 significant figures.
Answer:
The Molarity of the aqueous solution that is 18.2% by mass calcium chloride is 1.94 moles/liter.
Key points:
Molarity is the concentration of a solution in moles per liter. It is calculated by dividing the number of moles of a solution, n by its volume in liters, V. That is; Molarity = n/VWhen given the molarity of a solution and the volume of the solution then we can get the number of moles, by multiplying the molarity by volume; n = MV.Number of moles of a compound can also be given by dividing the mass of the compound by its relative molecular mass.The percentage by mass is given by;= (mass of solute/mass of the solution)×100%.
Density of a solution is give by dividing the mass of a solution by its volume. That is; density = mass/volume.Step by Step Explanation:
Step 1: Calculate the mass of the solute.
Percentage of solute by mass is 18.2%.
Assuming the mass of the solution to be 100g, then;
percentage by mass = (mass of solute/mass of the solution)×100%.
= 18.2 % = (x/100) × 100
= 0.182 = x/100
x = 18.2 g
Thus, mass of solute = 18.2 g
Step 2: Calculating the volume of the solution.
Density of the solution is 1.18 g/ml
But, density = mass/volume
Thus, Volume = mass/density
Mass of the solution is 100 g
Therefore;
Volume = 100 g/ 1.18 g/ml
= 84.75 mL or 0.08475 L
Step 3: Calculating the number of moles of the solute, Calcium chloride,
Number of moles = mass of solute/ molecular mass of solute
Mass of solute = 18.2 g
Molecular mass of Calcium chloride is 110.98 g/mol
Thus;
Number of moles = 18.2 g/110.98 g/mol
= 0.164 mole
Step 4: Calculating the molarity of the solution;
Molarity = number of moles/ volume in L
number of moles = 0.164 mole
Volume in L = 0.08475 L
Therefore;
Molarity = 0.164 mole/0.08475 L
= 1.94 moles/L or 1.94 M
What is the periodic element symbol for gold?
Gold is Au on the periodic table
The force of gravity between two objects is determined entirely by their masses. True or False?
Answer:
False
Explanation:
The force of gravity is not only determined by the mass of the two objects but also the distance.
The law of universal gravitation states the product of the masses is directly proportional to the gravitational force, but it is also indirectly proportional to the square of the distance between them.
In other words, the greater the masses of each the greater the gravitational force, but the greater the distance between the two, the weaker the gravitational force.
The ability to travel great distances in the shortest time was achieved by which invention?
By space travel.
Or aeroplanes.
Whichever one is in your choices
Which substance is formed when silica is melted (so that SiO 4 units are reorganized) and then cooled?
a. clay
b. glass
c. talc
d. feldspar
Answer:
Minerals, Rocks
Explanation:
c. talc
What is the “Ring of Fire?”
Answer:
The Ring of Fire is also called the Circum-Pacific Belt and refers to a path along the Pacific Ocean which is characterized by frequent earthquakes and active volcanoes.
Explanation:
The Ring of Fire is also called the Circum-Pacific Belt and refers to a path along the Pacific Ocean which is characterized by frequent earthquakes and active volcanoes.
The majority of Earth’s earthquakes and volcanoes usually occur along the Ring of Fire.
How are the following aspects of a reaction affected by the addition of a catalyst? 1) activation energy of the reverse reaction
a. Increased
b. Decreased
c. Not affected 2) Rate of the forward reaction
a. Increased
b. Decreased
c. Not affected 3) Rate of the reverse reaction
a. Increased
b. Decreased
c. Not affected 4) Activation energy of the forward reaction
a. Increased
b. Decreased
c. Not affected
These are four questions and four answers.
Answers:
1) activation energy of the reverse reaction
b. Decreased
2) Rate of the forward reaction
a. Increased
3) Rate of the reverse reaction
a. Increased
4) Activation energy of the forward reaction
b. decreased
Explanation:
Activarion energy is the energy required by the reactants to form the intermediate transition state and become products.
Catalysts are substances that change the path of the chemical reactions, lowering the activation energy, and thus speeding up the rate of the reactions, since the products can reach the new lower activation energy faster.
The equilibrium reactions are the chemical process in which two reactions, the forward and the reverese reactions, occur simultaneously and at the same rate. The equlibrium reactions may be represented by:
A ⇄ BWhere A → B is the direct or forward reaction, and A ← B is the reverse reaction (note the inversed arrow, from right to left).
For the direct reaction A represents the reactants and B represents the products. On the other hand, B represents the reactants and A represents the reactants of the reverse reaction and A. This, is A is the reactant of the forward reaction and the product of the reverse reaction, while B is the reactant of the reverse reaction and the product of the forward reaction.
Since, the addition of a catalyst lowers the activation energy of the process, the new activation energy is lower for both the forward and the reverse reaction, meaning that:
1. The activation energy of the reverse reaction is decreased (option b. of the first question)
2. The rate of the forward reaction is increased (option a. of the second question)
3. The rate of the reverse reaction is increased (option a. of the third question).
4. Activation energy of the forward reaction is decreased (option b. of the fourth question).
In summary, the addition of a catalyst decreases the activation energy for both forward and reverse reactions, and increases the rate of both forward and reverse reactions.
The following aspects of a reaction affected by the addition of a catalyst are
1) activation energy of the reverse reaction: b. Decreased2) Rate of the forward reaction: a. Increased3) Rate of the reverse reaction: a. Increased4) Activation energy of the forward reaction: b. decreasedExplanation:The following aspects of a reaction affected by the addition of a catalyst (it is a substance that enables a chemical reaction to proceed at a usually faster rate or under different conditions (as at a lower temperature) than otherwise possible) are
1) activation energy of the reverse reaction: b. Decreased
Energy of activation is the energy that must be provided to a chemical or nuclear system with potential reactants to result in: a chemical reaction, nuclear reaction, or other physical phenomena.
2) Rate of the forward reaction: a. Increased
Forward reaction is the reaction that products are produced from reactants and it goes from left to right in a reversible reaction.
3) Rate of the reverse reaction: a. Increased
A reversible reaction is a reaction in which the reactants form products react together to give the reactants back.
4) Activation energy of the forward reaction: b. decreased
The activation energy for the forward reaction is the free energy amount that must be added to go from the energy level of the reactants to the energy level of the transition state
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How many carbon atoms are found in 10.0g of c2h6?
Please explain.
Explanation:
Molar mass of C2H6= 2×12+6=30
30 g of C2H6 gives 1 mol of C2H6
10.0 g of C2H6 gives 1/30 ×10= 1/3 mol of C2H6
1 mol of C2H6 has 2 mol of Carbon
1/3 mol of C2H6 has 1/3 ×2 = 2/3 Molly of Carbon.
No. of atoms = 2/3× 6.023×10^23
=4.01×10^23
To determine the number of carbon atoms in 10.0 g of C2H6, calculate the number of moles from the mass and molar mass, and then multiply by Avogadro's number and the number of carbon atoms per molecule of ethane. This results in approximately 4.015 × 1023 carbon atoms.
Explanation:To find out how many carbon atoms are in 10.0g of C2H6, we first need to calculate the molar mass of ethane (C2H6). The molar mass is the sum of the masses of all the atoms in a molecule. Carbon has a molar mass of approximately 12 g/mol, and hydrogen has a molar mass of about 1 g/mol. Therefore, the molar mass of C2H6 is (2 × 12 g/mol) + (6 × 1 g/mol) = 30 g/mol.
Next, we calculate how many moles of C2H6 are in 10.0 g of the substance using the molar mass:
Number of moles of C2H6 = mass ÷ molar mass = 10.0 g ÷ 30 g/mol
This gives us approximately 0.333 moles of C2H6. Since each molecule of ethane contains 2 carbon atoms, we can find the total number of carbon atoms:
Total number of carbon atoms = number of moles of C2H6 × Avogadro's number × number of carbon atoms per molecule = 0.333 moles × 6.022 × 1023 atoms/mol × 2
Finally, this calculation will give us the total number of carbon atoms in 10.0 g of C2H6, which is approximately 4.015 × 1023 carbon atoms.
Give the numerical value of n corresponding to 3p.
The numerical value of n corresponding to '3p' is 3. The 3 denotes the energy level of an electron within an atom, while 'p' signifies the shape of the orbital the electron resides in.
Explanation:The numerical value of n corresponding to 3p in this context represents the principal quantum number in atomic theory, which is indicative of the energy level or shell of an atom in which an electron resides. For a 3p electron, the principal quantum number n = 3.
Just a little more context, the letter 'p' denotes the shape of the electron cloud, also known as the orbital. Orbital shapes are designated as s, p, d, and f. The '3p' specifically means that the electron is in the 3rd energy level (n = 3) and in a 'p' type orbital.
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How many electrons are shared in a triple covalent bond
Answer:
6
Explanation:
I took the question and got it right
Which of the following solvents will best dissolve wax, which is a complex mixture of compounds that mostly are CH3−CH2−CH2−CH2−CH2—? Structural formulas for molecules (a) (a) Hexane (a) Hexane is a six-carbon zigzag chain, with the terminal carbons single bonded to three Hs and all other Cs to two Hs. Structural formulas for molecules (b) (b) Benzene (b) Benzene is a six-membered ring with carbon as all of its vertices and alternating single and double bonds as the sides. Each carbon is also single bond-ed to H. Structural formulas for molecules (c) (c) Acetone (c) Acetone is a central C double bonded above to O and single bonded right and left, angled down, to CH3. Structural formulas for molecules (d) (d) Carbon tetrachloride (d) Carbon tetrachloride is a central C single bonded to four Cls. Structural formulas for molecules (e) (e) Water
Wax will be dissolved by nonpolar solvents: (a) hexane, (b) benzene and (d) carbon tetrachloride
Wax will not be dissolved by polar solvent such as (c) acetone and (e) water
A chemical formula is an expression used to represent
Answer:
A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements.
Explanation:
If only one atom of a specific type is present, no subscript is used. For atoms that have two or more of a specific type of atom present, a subscript is written after the symbol for that atom
Answer:
Compounds and elements
Explanation:
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what is the equilibrium constant of aA+bB=cC+dD
Answer:
Keq = [C]^c[D]^d/[A]ᵃ[B]ᵇ
Explanation:
The equilibrium constant (Keq) for a reaction is the ration between the product of products concentration over the product of the reactants concentration, each one is raised to its reaction coefficient.For the reaction: aA + bB ⇄ cC + dD:Keq = [C]^c[D]^d/[A]ᵃ[B]ᵇ
Considering the definition of Kc, the equilibrium constant of aA + bB ⇄ cC + cD is
[tex]Kc=\frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex]
Equilibrium is a state of a reactant system in which no changes are observed as time passes, despite the fact that the substances present continue to react with each other. In other words, reactants become products and products become reactants and they do so at the same rate.
In other words, chemical equilibrium is established when there are two opposite reactions that take place simultaneously at the same speed.
The concentration of reactants and products at equilibrium is related by the equilibrium constant Kc. Its value in a chemical reaction depends on the temperature.
Considering the expression of a generic reaction aA + bB ⇄ cC + cD, the value of Kc is
[tex]Kc=\frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex]
That is, the constant Kc is equal to the multiplication of the concentrations of the products raised to their stoichiometric coefficients by the multiplication of the concentrations of the reactants also raised to their stoichiometric coefficients.
In summary, the equilibrium constant of aA + bB ⇄ cC + cD is
[tex]Kc=\frac{[C]^{c} [D]^{d} }{[A]^{a} [B]^{b} }[/tex]
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The balanced equation for the reaction of copper (Cu) and silver nitrate (AgNO3) is shown below Cu+2AgNO3->2Ag+Cu(NO3)2 how many moles of copper must react to form 3.50 mol of Ag?
Answer:
1.75 mol of Cu
Explanation:
all you have to do is divide 3.50 by 2 because you need half moles from Ag
Answer: 1.75 mol of copper
Explanation: in the given balanced equation for the reaction of copper and silver nitrate, we can see that with one mol of copper, we can form two moles of silver (Ag), so we can calculate how many moles of copper we need to form 3.50 moles of Ag as follows:
3.50 moles of Ag *1 mol of copper/2 moles of Ag=
3.50mol of copper/2=
1.75 mol of copper
what’s the percent by mass of carbon in c10h14n2
Answer:
the answer is 74.03%
Explanation:
Add all the masses together, M of C = 120.1, M of H = 14.4 and M of N = 28.02. Adding all those together will give you the mass of the compound, then u divide the mass of carbon by the mass of compound and multiply by 100 to get the percent by mass.
120.1 + 14.4 + 28.02 = 162.26
120.1/162.26 x 100 = 74.03%
The percent by mass of carbon in C₁₀H₁₄N₂ is calculated by dividing the total mass of carbon in one mole of the compound by the molar mass of the entire compound and then converting to a percentage, which is approximately 74.03%.
The percent by mass of carbon in C₁₀H₁₄N₂, we need to determine the mass of carbon in one mole of the compound and then divide this by the molar mass of the entire compound.
The molar mass of carbon (C) is 12.01 g/mol. Since there are 10 carbon atoms in the compound, the total mass of carbon is 10 times 12.01 g/mol = 120.1 g/mol.
Next, let's find the molar mass of the entire compound:
Carbon (C): 10 times 12.01 g/mol = 120.1 g/mol
Hydrogen (H): 14 times 1.01 g/mol = 14.14 g/mol
Nitrogen (N): 2 times 14.01 g/mol = 28.02 g/mol
Adding these together, we get the molar mass of C₁₀H₁₄N₂:
120.1 g/mol (C) + 14.14 g/mol (H) + 28.02 g/mol (N) = 162.26 g/mol
The percent by mass of carbon is then calculated by:
(mass of C / molar mass of compound) times 100% = (120.1 g/mol / 162.26 g/mol) imes 100% = 74.03%
Therefore, the percent by mass of carbon in C₁₀H₁₄N₂ is approximately 74.03%.
how many moles of carbon dioxide gas co2 are there in 2.94 l of this gas at stp
Answer:
0.131 mol
Explanation:
there are 22.4 liters in a mol at STP so divide 2.94 by 22.4
Final answer:
To find the moles of carbon dioxide (CO₂) in 2.94 L at STP, one divides the volume of the gas by the molar volume of a gas at STP, which is 22.4 L/mol.
Explanation:
To calculate the number of moles of carbon dioxide gas (CO₂) at standard temperature and pressure (STP), we use the information that at STP, one mole of a gas occupies 22.4 liters. Thus, we can convert the given volume of carbon dioxide to moles using the following relationship:
Number of moles = Volume of gas at STP / Molar volume of gas at STP
The molar volume at STP is 22.4 L/mol. So for 2.94 L of CO₂, the calculation would be as follows:
Number of moles of CO₂ = 2.94 L / 22.4 L/mol
= 0.131 Moles
After performing the division, we will arrive at the 0.131 of moles, which represents the amount of carbon dioxide in the given volume at STP.
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Answer:
2CO₂ ⇄ 2CO + O₂.
Explanation:
The equilibrium constant (Keq) for a reaction is the ratio of the concentration of the products to the reactants, each one is raised to each molar coefficient.So, for Keq = [CO]²[O₂]/[CO₂]²,
It is clear that the products are CO and O₂, while the reactant is CO₂.
So, the reaction for this is:
2CO₂ ⇄ 2CO + O₂.