Thermo Chemistry

Question

2CO(g) + O₂(g) ↔ 2 CO₂(g); ΔH^o = -5182.2 kJ; ΔS^o = 326.2 ^J/_K

_Calculate ΔG in kJ

Answer 1

If you are looking for ∆Gº from ∆Hº and ∆Sº, the standard temperature would be 298K and pressure = 1 atm

∆Gº = ∆Hº - T∆Sº

∆Gº = -(-5182 kJ) - (298K)(0.3262 kJ/K) ... note to change units of ∆Sº to be consistent with units of ∆Hº

∆Gº = 5182 kJ - 97.2 kJ = 5085 kJ