Question

In: Chemistry

Find the average enthalpy of the SO bond in SO3(g) from the following standard molar enthalpies...

Find the average enthalpy of the SO bond in SO3(g) from the following standard molar enthalpies of formation (in kJ/mol): SO3(g) (–395.72), S(g) (278.81), O(g) (249.17).

a. 474.0 kJ/mol

b. 264.9 kJ/mol

c. 923.7 kJ/mol

d. 307.9 kJ/mol

e. 630.6 kJ/mol

Expert Solution

Correct answer is : (a.) 474.0 kJ/mol

Explanation

The reaction for the formation of SO₃ (g) is

S (g) + 3 O (g) SO₃ (g)

enthalpy change = H^o_f reactants - H^o_f products

enthalpy change = [H^o_f S (g) + 3 * H^o_f O (g)] - [H^o_f SO₃ (g)]

enthalpy change = [278.81 kJ/mol + 3 * (249.17 kJ/mol)] - (-395.72 kJ/mol)

enthalpy change = 278.81 kJ/mol + 747.51 kJ/mol + 395.72 kJ/mol

enthalpy change = 1422.04 kJ/mol

average enthalpy of SO bond = (enthalpy change) / 3

average enthalpy of SO bond = (1422.04 kJ/mol) / 3

average enthalpy of SO bond = 474.0 kJ/mol

queen_honey_blossom answered 2 years ago

A.) the standard enthalpy of formation of the reaction C2H4(g)+H2O(l)=C2H5OH(l) B.) Use standard enthalpies of formation...

A.) the standard enthalpy of formation of the reaction C2H4(g)+H2O(l)=C2H5OH(l) B.) Use standard enthalpies of formation to calculate the standard enthalphy change of: the reaction of methane gas, CH4, with chlorine rine to form liquid chloroform, CHCl3. Gaseuous hydrogen chloridee is the other product. C.) Use standard enthalpies of formation to calculate the standard enthalphy change of PCl3(g)+HCl(g)=PCl5(g)+H2(g)

Part A. Calculate the enthalpy of the reaction 2NO(g)+O2(g)?2NO2(g) given the following reactions and enthalpies of...

Part A. Calculate the enthalpy of the reaction 2NO(g)+O2(g)?2NO2(g) given the following reactions and enthalpies of formation: 12N2(g)+O2(g)?NO2(g), ?H?A=33.2 kJ 12N2(g)+12O2(g)?NO(g), ?H?B=90.2 kJ Part B. Calculate the enthalpy of the reaction 4B(s)+3O2(g)?2B2O3(s) given the following pertinent information: B2O3(s)+3H2O(g)?3O2(g)+B2H6(g), ?H?A=+2035 kJ 2B(s)+3H2(g)?B2H6(g), ?H?B=+36 kJ H2(g)+12O2(g)?H2O(l), ?H?C=?285 kJ H2O(l)?H2O(g), ?H?D=+44 kJ

Part A Calculate the enthalpy of the reaction 2NO(g)+O2(g)→2NO2(g) given the following reactions and enthalpies of...

Part A Calculate the enthalpy of the reaction 2NO(g)+O2(g)→2NO2(g) given the following reactions and enthalpies of formation: 12N2(g)+O2(g)→NO2(g), ΔfH∘A=33.2 kJ mol−1 12N2(g)+12O2(g)→NO(g), ΔfH∘B=90.2 kJ mol−1 Express your answer with the appropriate units. Part B Calculate the enthalpy of the reaction 4B(s)+3O2(g)→2B2O3(s) given the following pertinent information: B2O3(s)+3H2O(g)→3O2(g)+B2H6(g), ΔrH∘A=+2035 kJ mol−1 2B(s)+3H2(g)→B2H6(g), ΔrH∘B=+36 kJ mol−1 H2(g)+12O2(g)→H2O(l), ΔrH∘C=−285 kJ mol−1 H2O(l)→H2O(g), ΔrH∘D=+44 kJ mol−1 Express your answer with the appropriate units.

1)Using average bond enthalpies, predict which of the following reactions will be most exothermic: a) C(g)...

1)Using average bond enthalpies, predict which of the following reactions will be most exothermic: a) C(g) + 2 F2(g) b) CO(g) +3 F2(g) CF4(g) + OF2(g) c) CO2(g) + 4 F2(g) CF4(g) + 2 OF2(g) 2) Ammonia is produced directly from nitrogen and hydrogen. The chemical reaction is N2(g) + 3 H2(g) 2 NH3(g) N≡N a) Use Table 8.4 p 326 in textbook (or you can find the table in the chapter 5 slides on the UR course), to estimate...

Use average bond energies to estimate the enthalpy changes of the following reactions: a. N2(g) +...

Use average bond energies to estimate the enthalpy changes of the following reactions: a. N2(g) + 3 H2(g) -> 2 NH3(g) b. N2(g) + 2 H2(g) -> H2NNH2(g) c. 2 N2(g) + O2(g) -> 2 N2O(g)

Use bond enthalpies to estimate a) the enthalpy of the anaerobic breakdown of glucose to lactic...

Use bond enthalpies to estimate a) the enthalpy of the anaerobic breakdown of glucose to lactic acid in cells that are starved of oxygen, C6H12O6(aq) → 2 CH3CH(OH)COOH(aq), b) the enthalpy of combustion of glucose. Ignore the contributions of enthalpies of fusion and vaporization.

Calculate the enthalpy of the reaction 2NO(g)+O2(g)→2NO2(g) given the following reactions and enthalpies of formation: 12N2(g)+O2(g)→NO2(g),...

Calculate the enthalpy of the reaction 2NO(g)+O2(g)→2NO2(g) given the following reactions and enthalpies of formation: 12N2(g)+O2(g)→NO2(g), ΔH∘A=33.2 kJ 12N2(g)+12O2(g)→NO(g), ΔH∘B=90.2 kJ

Calculate the standard enthalpy of reaction of the following: a. C2H2(g) + O2(g)  2CO(g) +...

Calculate the standard enthalpy of reaction of the following: a. C2H2(g) + O2(g)  2CO(g) + H2O(l) b. NaOH(s) + HCl(g)  NaCl(s) + H2O(l) c. H2SO4(l) + 2 NaOH(s)  Na2SO4(s) + H2O(l)

Calculate the enthalpy of the reaction 2NO(g)+O2(g)?2NO2(g) given the following reactions and enthalpies of formation: 12N2(g)+O2(g)?NO2(g), ?H?A=33.2...

Calculate the enthalpy of the reaction 2NO(g)+O2(g)?2NO2(g) given the following reactions and enthalpies of formation: 12N2(g)+O2(g)?NO2(g), ?H?A=33.2 kJ 12N2(g)+12O2(g)?NO(g), ?H?B=90.2 kJ Express your answer with the appropriate units. ?H? = Part B Calculate the enthalpy of the reaction 4B(s)+3O2(g)?2B2O3(s) given the following pertinent information: B2O3(s)+3H2O(g)?3O2(g)+B2H6(g), ?H?A=+2035 kJ 2B(s)+3H2(g)?B2H6(g), ?H?B=+36 kJ H2(g)+12O2(g)?H2O(l), ?H?C=?285 kJ H2O(l)?H2O(g), ?H?D=+44 kJ Express your answer with the appropriate units. ?H? =

The hydrocarbon butane has the structure Use the average bond enthalpies from the table below to...

The hydrocarbon butane has the structure Use the average bond enthalpies from the table below to estimate the change in enthalpy ΔH° for the reaction 2 C4H10(g) + 13 O2(g)8 CO2(g) + 10 H2O(g) ΔH° = kJ bond kJ/mol bond kJ/mol C-H 413 C-O 351 C-C 348 C=O 728 C=C 615 O-H 463 C≡C 812 O=O 498