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

Multiple Choice

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

A) -60.0 kJ mol^-1
B) +651.6 kJ mol^-1
C) -265.8 kJ mol^-1
D) +137.2 kJ mol^-1
E) +523.0 kJ mol^-1