Compare the ability of H2 (g) and CO (g) to reduce NiO to Ni.

For the reaction: 2CO (g) + O2 (g) -> 2CO2 (g), G0 = -546,800 + 173.6T

For the reaction: H2 (g) + 1/2O2 (g) -> H2O (g), G0 = -247,500 + 55.9T

a) At T = 1273 K, which gas is a better reducing agent?

b) At what temperature do these two gases reduce NiO to Ni equally well?