Determine ΔG°rxn for the following reaction at 318 K.

Question

FeO(s) + CO(g) → Fe(s) + CO₂(g)             ΔH°= -11.0 kJ; ΔS°= -17.4 J/K

Answer 1

∆Gº = ∆Hº - T∆Sº

∆Gº = ?

∆Hº = -11.0 kJ

∆Sº = -17.4 J / K = -0.0174 kJ / K (to get units to be same as that for ∆Hº)

T = 318K

Solving for ∆Hº, we have ...

∆Gº = -11.0 kJ - (318K)(-0.0174 kJ/K)

∆Gº = -11.0 kJ - (-5.5 kJ)

∆Gº = -5.5 kJ