At standard conditions, N2 + 2O2 ⇌ 2NO2; ΔG° = 100 kJ/mole NO + ½O2 ⇌ 2NO2; ΔG° = -35 kJ/mole The standard free energy of formation of NO in kJ/mole is___________________?
Correct answer: C. 85
- A. 15
- B. 30
- C. 85
- D. 170
Explanation
The first reaction gives ΔG°f(NO₂) = 100/2 = 50 kJ/mol. From NO + ½O₂ → NO₂, −35 = 50 − ΔG°f(NO), so ΔG°f(NO) = 85 kJ/mol.
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