One of the reactions that occurs within a catalytic converter in the exhaust pipe of a car is the simultaneous oxidation of carbon monoxide and reduction of NO (both of which are harmful pollutants): 2CO(g)+2NO(g)→2CO2(g)+N2(g)

Substance ΔG∘f(kJ/mol)
O2(g) 0
O3(g) +163.2
CO(g) −137.2
CO2(g) −394.4
N2(g) 0
NO(g) +87.6
NO2(g) +51.3

Use standard free energies of formation to determine ΔG∘rxn for this reaction at 25°C. Express the free energy change to four significant figures and include the appropriate units.