Question

In: Chemistry

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)

Expert Solution

Using Bond energy values to calculate enthalpy of rxn:

a) N2 (g) +3H2(g)---->2NH3(g)

Bonds breaking in reactants	bond energy in KJ
NN	1mol*941KJ/mol941KJ
H-H	3mol*(432KJ/mol)1296KJ

bond making in products	bond energy in KJ
N-H	6mol*(391KJ/mol)2346KJ
-	-

enthalpy of rxnenergy required for bond breaking-energy required for bond making(941+1296)-2346-109 KJ

enthalpy change of rxn -109KJ

b) N2 (g) +2H2(g)---->H2NNH2(g)

Bonds breaking in reactants	bond energy in KJ
NN	1mol*941KJ/mol941KJ
H-H	2mol*(432KJ/mol)864KJ

bond making in products	bond energy in KJ
N-H	4mol*(391KJ/mol)1564KJ
N-N	1mol*160KJ/mol160KJ

enthalpy of rxnenergy required for bond breaking-energy required for bond making(941+864)-(1564+160)81 KJ

enthalpy changes of rxn81KJ

c)2N2 (g) +O2(g)---->2N2O(g)

N2O structure:NN-O

Bonds breaking in reactants	bond energy in KJ
NN	2mol*941KJ/mol1882KJ
OO	1mol*(495KJ/mol)495KJ

bond making in products	bond energy in KJ
NN	2mol*941KJ/mol1882KJ
N-O	2mol*201KJ/mol402KJ

enthalpy of rxnenergy required for bond breaking-energy required for bond making(1882+495)-(1882+402) 93KJ

enthalpy changes of rxn93KJ

queen_honey_blossom answered 1 year ago

Given the following bond-dissociation energies, calculate the average bond enthalpy for the Ti-Cl bond.

The enthalpy change for the following reaction is -136 kJ. Using bond energies, estimate the H-O...

The enthalpy change for the following reaction is -136 kJ. Using bond energies, estimate the H-O bond energy in H2O2(g). H2(g) + O2(g) --> H2O2(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.

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

The following enthalpy and entropy changes are known for the reactions shown at 298 K. Reaction...

The following enthalpy and entropy changes are known for the reactions shown at 298 K. Reaction Cu(s) + 2H+(aq) <=> Cu2+(aq) + H2(g) Zn(s) + 2H+(aq) <=> Zn2+(aq) + H2(g) delta H 65 kJ/mol -153 kJ/mol delta S -2.1 J/mol K -23.1 J/mol K Part a Which of the these two metals, Zn or Cu, should dissolve in 1 M acid solution? Explain your answer. Part B - Calculate Eo for the Zn reaction. Show work to support your answer....

All of the reactions shown are oxidationreduction reactions except A) N2(g) + O2 (g) → 2...

All of the reactions shown are oxidationreduction reactions except A) N2(g) + O2 (g) → 2 NO(g) B) 2 Fe2O3 (s) → 4 Fe(s) + 3 O2 (g) C) Zn(s) + 2 HCl(aq) → ZnCl2 (aq) + H2 (g) D) CH4(g) + 2 O2 (g) → CO2(g) + 2 H2O(l) E) K2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2 KCl(aq)

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.

Calculate ΔG∘rxn for the following reaction: 4CO(g)+2NO2(g)→4CO2(g)+N2(g). Use the following reactions and given ΔG∘rxn values: 2NO(g)+O2(g)→2NO2(g),...

Calculate ΔG∘rxn for the following reaction: 4CO(g)+2NO2(g)→4CO2(g)+N2(g). Use the following reactions and given ΔG∘rxn values: 2NO(g)+O2(g)→2NO2(g), ΔG∘rxn= - 72.6 kJ 2CO(g)+O2(g)→2CO2(g), ΔG∘rxn= - 514.4 kJ 12O2(g)+12N2(g)→NO(g), ΔG∘rxn= 87.6 kJ

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...