Use Hess's Law to Calculate ΔG°_rxn Using the Following Information

Multiple Choice

Use Hess's law to calculate ΔG°_rxn using the following information.
CO(g) → C(s) + 1/2 O₂(g) ΔG°_rxn = ?
CO₂(g) → C(s) + O₂(g) ΔG°_rxn = +394.4 kJ
CO(g) + 1/2 O₂(g) → CO₂(g) ΔG°_rxn = -257.2 kJ

A) -60.0 kJ
B) +651.6 kJ
C) -265.8 kJ
D) +137.2 kJ
E) +523.0 kJ