Carbon monoxide is toxic because it bonds much more strongly to the iron in hemoglobin (Hgb) than

Question:

Carbon monoxide is toxic because it bonds much more strongly to the iron in hemoglobin (Hgb) than does O2. Consider the following reactions and approximate standard free energy changes:
Hgb + O2 → HgbO2 ΔGo = –70 kJ
Hgb + CO → HgbCO ΔGo = –80 kJ
Using these data, estimate the equilibrium constant value at 25oC for the following reaction:
HgbO2 + CO ⇌ HgbCO + O2