The heat of reaction for the combustion of c2h4 is -1411 kj/mol. how many grams of c2h4 must burn

Final answer:

The molar enthalpy change of H2O (l) when liquid water is heated from 41.7 C to 76.2 C can be calculated using the formula: Q = mcΔT

Explanation:

The molar enthalpy change of H2O (l) when liquid water is heated from 41.7 C to 76.2 C can be calculated using the formula:

Q = mcΔT

Where,

From the given equation, we can calculate the molar enthalpy change when 1 mole of water is heated using the molar mass of water (18.015 g/mol).

Using the formula:

ΔH = Q / n

Where,

We can substitute the values into the formula and calculate the molar enthalpy change.

The balanced molecular equation for the given reaction is:

[tex]2CH_3COOH(aq) \ + \ Ba(OH)_2(aq) \rightarrow \ Ba(CH_3COO)_2(aq) + 2H_2O(l).[/tex]

To check that the equation is balanced count how many atoms are present for each element in the reactant and product side. If they are the same before and after reaction for all elements, then the reaction is deemed balanced.

The atom counting for the equation is shown below:

[tex]2CH_3COOH(aq) \ + \ Ba(OH)_2(aq) \rightarrow \ Ba(CH_3COO)_2(aq) + 2H_2O(l).[/tex]

Reactants                  →                 Products

C:  (2 x 2) =4                                  C: (2 x 2) = 4

H: (2 x 4) + (1 x 2) =10                    H: (3 x 2) + (2 X 2) = 10

O: (2 x 2) + (1 x 2) = 6                    O: (2 x 2) + (2 x 1) = 6

Ba: 1                                               Ba: 1

Since the number of atoms of each element are similar in the reactants and products, the equation is balanced.

To determine the state of the substances, consider their solubility.

The reactants are both aqueous (aq) as indicated in the problem.

The first product, [tex]Ba(CH_3COO)_2[/tex] is aqueous (aq) because based on the solubility rule, it will dissolve in water. Acetates are generally soluble.

The other product is water which will be liquid (l) since it is the solvent used to dissolve the substances.

Keywords: acid-base, neutralization, balancing equations, molecular equation

The balanced molecular equation for reaction of acetic acid and barium hydroxide is as follows:

[tex]\boxed{2\text{CH}_3\text{COOH}(aq)+\text{Ba(OH)}_2(aq)\rightarrow\left(\text{CH}_3\text{COO}\right)_2\text{Ba} (aq)+2\text{H}_2\text{O}(l)}[/tex]

Further Explanation:

Neutralization reaction:

This reaction occurs when acid and base react with each other and salt and water are formed. Since these reactions neutralize excess amount of hydrogen or hydroxide ions in the solution, it is named so.

Acetic acid is weak acid and barium hydroxide is strong base. Both react with each other to form salt and water and neutralization reaction takes place.

Chemical equations are written in following different types of equations:

In molecular equations, reactants and products are present in undissociated form. Total ionic equations involve all different types of ions involved in the reactions. But in net ionic equations, only useful ions are written.

In this reaction, [tex]\text{CH}_3\text{COOH}[/tex], reacts with [tex]\text{Ba(OH)}_2[/tex] to form [tex]\left(\text{CH}_3\text{COO}\right)_2\text{Ba}[/tex] and [tex]\text{H}_2\text{O}[/tex]. Here, [tex]\text{CH}_3\text{COOH}[/tex], [tex]\text{Ba(OH)}_2[/tex] and [tex]\left(\text{CH}_3\text{COO}\right)_2\text{Ba}[/tex] are present in aqueous phase while [tex]\text{H}_2\text{O}[/tex] is present in liquid phase. Unbalanced molecular equation becomes,

[tex]\text{CH}_3\text{COOH}(aq)+\text{Ba(OH)}_2(aq)\rightarrow\left(\text{CH}_3\text{COO}\right)_2\text{Ba} (aq)+\text{H}_2\text{O}(l)[/tex]

Number of atoms of all elements on both sides of reaction is written.

On reactant side,

Number of C atom is 1.

Number of H atoms is 6.

Number of Ba atoms is 1.

Number of O atoms is 4.

On the product side,

Number of C atom is 2.

Number of H atoms is 8.

Number of Ba atoms is 1.

Number of O atoms is 5.

Initially, atoms other than carbon, oxygen, and hydrogen are balanced by multiplying with some number on any side. Ba atoms are balanced on both sides. So carbon, hydrogen and oxygen atoms are balanced now. For this, [tex]\text{CH}_3\text{COOH}[/tex] is multiplied by 2 and [tex]\text{H}_2\text{O}[/tex] by 2. Now the balanced equation is as follows:

[tex]2\text{CH}_3\text{COOH}(aq)+\text{Ba(OH)}_2(aq)\rightarrow\left(\text{CH}_3\text{COO}\right)_2\text{Ba} (aq)+2\text{H}_2\text{O}(l)[/tex]

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Answer details:

Grade: High School

Subject: Chemistry

Chapter: Chemical reactions and equations

Keywords: chemical reactions, reactants, products, molecular equations, net ionic equation, CH3COOH, H2O, Ba(OH)2, (CH3COO)2Ba, Ba, O, H, C.

Answer:

The correct option is:

"Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right"

Explanation:

You have the following function:

[tex]f(x)=y=4*(\frac{1}{2}) ^{x+1} -3[/tex]

The intersection on the "y" axis implies that the value at "x" must be zero. So, to calculate the value in "y" you must replace "x" with the value 0 and perform the corresponding calculations:

[tex]y=4*(\frac{1}{2}) ^{0+1} -3[/tex]

[tex]y=4*(\frac{1}{2}) -3[/tex]

[tex]y=2 -3[/tex]

[tex]y=-1[/tex]

Being (x, y) a point on the graph,  the y- intercept is (0,-1).

This function is an exponential function function, whose form corresponds to the general expression:

[tex]g(x)=k*a^{x-h} +b[/tex]

Where:

The graph of the function is shown in the attached image.

The correct option is:

"Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right"

Answer:

greater than

Explanation:

just took it and yes i know someone already answered but i figred this would be quicker!!!!!!

Answer:

1

Explanation:

Just got it right on the quiz.

That is the exchange to fill.

Hope this helps.

N2 has a lower boiling point than CO because N2, being a nonpolar molecule, can't exhibit dipole-dipole attractions that CO, being a polar molecule, can. This results in weaker intermolecular forces in N2 than CO, hence a lower boiling point.

The reason why N2 has a lower boiling point than CO is due to the different intermolecular forces they experience. Both CO and N2 are diatomic molecules with similar atomic masses, therefore, they experience similar London dispersion forces. However, the key difference is that CO is a polar molecule and thus, it experiences dipole-dipole attractions. On the other hand, N2 is a nonpolar molecule and therefore, can't exhibit dipole-dipole attractions. Hence, the dipole-dipole attractions in CO are stronger than the dispersion forces in N2, leading to a higher boiling point for CO.

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Hello!

If 832J of energy is required to raise the temperature of a sample of aluminum from 20.0°C to 97.0°C, what mass is the sample of aluminum? (The specific heat of aluminum is 0.90 J/(g × °C).

a) 0.10 g

b) 10.0 g

c) 12.0 g

d) 57.7 g

Data:

Q (Amount of heat) = 832 J

m (mass) = ?

c (Specific heat) = 0.90 J/(g × ° C)

T (final) = 97 ºC

To (initial) = 20 ºC

ΔT = T - To → ΔT = 97 - 20 → ΔT = 77 ºC

Formula:

Q = m*c*ΔT  

Solving:

[tex]Q = m*c*\Delta{T}[/tex]

[tex]832 = m*0.90*77[/tex]

[tex]832 = 69.3\:m[/tex]

[tex]69.3\:m = 832[/tex]

[tex]m = \dfrac{832}{69.3}[/tex]

[tex]\boxed{\boxed{m \approx 12.00\:g}}\end{array}}\qquad\quad\checkmark[/tex]

Answer:

12.0 g

____________________________________

I Hope this helps, greetings ... Dexteright02! =)

The chemical formula of that compound is POCl₃ and Its chemical name is phosphoryl chloride.

It is a chemical compound and its formula is POCl₃. It is manufactured industrially on a large scale from phosphorus trichloride and oxygen. It is a colorless liquid and has a pungent smell, Its molar mass is 153.33 grams per mole, its melting and boiling points are 274.4 K and 378.9 K respectively, it is soluble in water, and its molecular shape is tetrahedral. It is a reducing agent.

It is used in the making of semiconductors, plasticizers, hydraulic fluids, organophosphorus, and pesticides, and it is widely used as a chlorinating agent and dehydrating agent in laboratories.

Hence, the chemical formula of phosphoryl chloride is POCl₃.

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As you move across a period, the atomic mass increases because the atomic number also increases. ... The atomic mass for any given atom mainly comes from the mass of the protons and neutrons.

Moving from left to right across a period on the periodic table, the atomic mass of the elements generally increases. This is due to an increase in the number of protons and neutrons in the nucleus. For instance, in the second period, the atomic mass of Lithium is less than that of Neon.

As you move from left to right across a period on the periodic table, there is an increase in the atomic mass of the elements. This happens because the number of protons, which contribute to the atomic mass, in the nucleus of an atom increases. The atomic mass is approximated by the mass number, which is the sum of the number of protons and neutrons in an atom's nucleus. Therefore, as the number of protons (and usually neutrons) increases, the atomic mass of the elements also generally increases.

For example, in the second period, the atomic mass of Lithium (Li) is about 7 amu, while the atomic mass of Neon (Ne), at the end of the same period, is about 20 amu.

Thus, when moving from left to right within a period of the periodic table, the atomic mass generally increases due to an increase in the number of protons and neutrons in the nucleus.

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For energy level 5, there are five sublevels (s, p, d, f, and g).

In the periodic table, the energy level of an element is represented by the principal quantum number (n). Energy level 5 corresponds to the principal quantum number (n = 5). The sublevels within an energy level are represented by the azimuthal quantum number (l). The possible values of l range from 0 to (n - 1).

Therefore, for energy level 5 (n = 5), the possible values of l would be 0, 1, 2, 3, and 4.

Each value of l corresponds to a different sublevel designation:

l = 0: s-sublevel

l = 1: p-sublevel

l = 2: d-sublevel

l = 3: f-sublevel

l = 4: g-sublevel

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Answer:

The molar solubility of [tex]Ni(OH)_2[/tex] in water [tex]7.93\times10^{-6} mol/L[/tex].

Explanation:

[tex]Ni(OH)_2\rightleftharpoons Ni^{2+}+2OH^-[/tex]

                        S        2S

Solubility of Nickel hydroxide =[tex]K_{sp}=2.0\times 10^{-15}[/tex]

[tex]K_{sp}=S\times 2S^{2}=4S^3[/tex]

[tex]2.0\times 10^{-15}=4S^3[/tex]

[tex] S=7.93\times10^{-6} mol/L[/tex]

The molar solubility of [tex]Ni(OH)_2[/tex] in water [tex]7.93\times10^{-6} mol/L[/tex].

Answer:

C

Explanation:

Answer: A carbon atom is most likely to form covalent bond(s) with other atoms.

Explanation:

Carbon atom is a group 14 element and its atomic number is 6. So, electronic distribution of carbon is 2, 4.

That is, it contains only 4 valence electrons. So, in order to attain stability it always needs to gain 4 more electrons by sharing its valence electrons with other atom.

Since, compounds formed due to sharing of electrons are known as covalent compounds.

Therefore, we can conclude that a carbon atom will always form covalent bond with other atoms.

A carbon atom is most likely to form covalent kind of bond with atoms. Therefore, the correct option is option B.

Two atoms sharing electron pairs form a type of chemical bond known as a covalent bond. Atoms in a molecule are joined by a powerful bond. In covalent bonds, electrons are often shared between nonmetal atoms in order to create a stable electron configuration. The two atoms are attracted to one another due to their common electron pair, which keeps them together in a molecule. The formation and stabilisation of molecules like water and methane depend heavily on covalent bonds.

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Final answer:

To find the total moles of atoms in the propane sample, consider its molecular formula, with 3 carbon atoms and 8 hydrogen atoms.

Explanation:

The total moles of atoms in the propane sample can be calculated by considering the molecular formula of propane, C₃H₈.

Propane consists of 3 carbon atoms and 8 hydrogen atoms.

Therefore, in the given sample, there are a total of 3 x 15.7 moles of carbon atoms and 8 x 15.7 moles of hydrogen atoms.

Final answer:

Bromine is added to an organic molecule to test for saturation; it reacts with unsaturated compounds causing a color change, while the color remains the same in the presence of saturated compounds.

Explanation:

The substance added to an organic molecule to test for the degree of saturation is bromine. This test is based on bromine's distinctive brownish-orange color, which fades upon reaction with unsaturated compounds. In the reaction, bromine is added to the double or triple bonds present in unsaturated hydrocarbons, causing a decolorization as it forms a dibromo compound. On the other hand, if the organic molecule is saturated, the bromine retains its color as there are no double or triple bonds for the bromine to react with.

On a molecular level, the reaction demonstrates the difference between saturated and unsaturated hydrocarbons. Saturated hydrocarbons, such as alkanes, have a C-H bond that can potentially react with bromine, whereas unsaturated hydrocarbons like alkenes and alkynes have double or triple bonds that readily react with bromine, respectively. This chemical behavior is part of the microscopic domain that helps distinguish structural differences in organic compounds.

Boron is 5 in the periodic table of elements and the mass is rounded up 10 11. If the atomic number of boron is 5, that means that there would be 5 protons and 5 electrons.

Final answer:

A single measurement cannot be considered precise as precision requires consistency across multiple measurements. However, a single measurement can be considered accurate if it closely matches the true or accepted value. Accuracy and precision are critical in scientific measurements for validity.

Explanation:

The concepts of accuracy and precision are fundamental in scientific measurements. When it comes to a single measurement being considered precise or accurate, context is essential. Precision refers to the consistency of repeated measurements. Therefore, one isolated measurement cannot be labeled as 'precise' without additional data to compare it to. However, a single measurement can be considered accurate if it is very close to the true or accepted value. For instance, if you measure a piece of standard computer paper and it states that it is 11.0 inches long, if you measure it once and obtain 11.1 inches, that single measurement can be considered quite accurate, assuming the stated length is correct.

Nevertheless, precision is really about the reproducibility of multiple measurements, and accuracy concerns how close a measurement is to the true or accepted reference value. For instance, if you have a series of measurements showing 11.1 in., 11.2 in., and 10.9 in., these could be considered both accurate and precise, as they are close to the true value of 11.0 inches and to each other. Conversely, a single measurement of 12 inches would be neither accurate (not close to 11.0 inches) nor precise if the rest of the measurements are significantly different from 12 inches.

Answer:

Explanation:

The amine functional group is obtained by subsititution of one or more hydrogen atoms in the ammonia compound.

Ammonia is NH₃.

Then,

                        R'''

                         |

                 R' -  N - R''

In this case, the three subsitutuents are silyl groups. The silyl group is derived form silane and is SiH₃. So, the tcompound trisilylamine is:

                    SiH₃

                      |

          SiH₃ -  N - SiH₃

Thus, you can count 3 hydrogen atoms for every silylgroup for a total of 9 hydrogen atoms in each molecule of trisilylamine.

The correct option is b. The balanced chemical equation for the combustion of propane is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. The molar ratio of the reactants and products is 1:5:3:4. Therefore, the correct option given is Reactants: C₃H₈ = 1, O₂ = 5; Products: CO₂ = 3, H₂O = 4.

The molar ratio for the combustion of propane (C₃H₈ ), we must first balance the chemical equation. The unbalanced equation is: C₃H₈ + O₂ → CO₂ + H₂O

Balancing carbon (C) atoms: C₃H₈ + O₂ → 3CO₂ + H₂O

Balancing hydrogen (H) atoms: C₃H₈ + O₂ → 3CO₂ + 4H₂O

Balancing oxygen (O) atoms: C₃H₈ + 5O₂ → 3CO2 + 4H₂O

Therefore, the balanced equation is: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

From this balanced equation, we see the molar ratio is: C₃H₈ : O₂ : CO₂ : H2O = 1 : 5 : 3 : 4

Thus, the correct choice is B : Reactants: C₃H₈ = 1, O₂= 5; Products: CO₂ = 3, H2O = 4

The pH of a 0.0075 M concentration of hydrochloric acid HCl equals 2.1, calculated using the formula pH = -log[H3O+].

The pH of a solution can be determined using the formula pH = -log[H3O+]. In the case of a 0.0075 M concentration of hydrochloric acid (HCl), HCl is a strong acid and so it will ionize completely in water to form H+ (or H3O+) and Cl- ions. Since the concentration of H+ ions equals the initial concentration of the acid, we have [H3O+] = 0.0075 M. Applying the formula, we would find the pH = -log(0.0075) which equals roughly 2.1. This means that the pH of 0.0075 M HCl is 2.1.

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