Question

THERE IS NO OTHER INFORMATION GIVEN BESIDES 298K

Exercise 19.87

The following reactions are important ones in catalytic converters in automobiles. Calculate ΔG∘for each at 298 K. Predict the effect of increasing temperature on the magnitude of ΔG∘.

Part A

2CO(g)+2NO(g)→N2(g)+2CO2(g)

Express your answer using four significant figures.

ΔG∘rxn =

  kJ  

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Part B

ΔG will increase with increasing temperature.

ΔG will decrease with increasing temperature.

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Part C

5H2(g)+2NO(g)→2NH3(g)+2H2O(g)

Express your answer using four significant figures.

ΔG∘rxn =

  kJ  

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Part D

ΔG will increase with increasing temperature.

ΔG will decrease with increasing temperature.

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Part E

2H2(g)+2NO(g)→N2(g)+2H2O(g)

Express your answer using four significant figures.

ΔG∘rxn =

  kJ  

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Part F

ΔG will increase with increasing temperature.

ΔG will decrease with increasing temperature.

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Part G

2NH3(g)+2O2(g)→N2O(g)+3H2O(g)

Express your answer using four significant figures.

ΔG∘rxn =

  kJ  

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Part H

ΔG will increase with increasing temperature.

ΔG will decrease with increasing temperature.

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Answer 1

Part A : 2CO(g)+2NO(g)→N2(g)+2CO2(g) : ΔG^o_rxn = ?

ΔG^o_rxn = ΔG⁰_fproducts – ΔG⁰_freactants

ΔG^o_rxn = [(ΔG⁰_fN2(g) )+ (2 x ΔG⁰_{fCO2 (g)} )]- [( 2 x ΔG⁰_fCO(g) )+ (2 x ΔG⁰_{fNO (g)} )]

= [(0)+(2x(-394.4))] - [(2x(-137.3))+ (2x(86.6))] kJ/mol

= -687.4 kJ

Part B : Since ΔG^o_rxn is negative upon increase in temperature ΔG^o_rxn also increases

Part C : 5H2(g)+2NO(g)→2NH3(g)+2H2O(g) : ΔG^o_rxn = ?

ΔG^o_rxn = ΔG⁰_{f  products} – ΔG⁰_{f  reactants}

ΔG^o_rxn = [(2xΔG⁰_f  NH3(g) )+ (2 x ΔG⁰_{f  H2O (g)} )]- [( 5x ΔG⁰_fH2(g) )+ (2 x ΔG⁰_{f  NO (g)} )]

= [(2x(-16.5))+(2x(-228.6))] - [(5x0)+ (2x(86.6))] kJ/mol

= -663.4 kJ

Part D : Since ΔG^o_rxn is negative upon increase in temperature ΔG^o_rxn also increases