Use Hess’s law to calculate the standard heat of the water-gas shift reaction CO (g) + H₂O (v) → CO₂ (g) + H₂ (g) from each of the two sets of data given here.

(a) CO (g) + H₂O (l) → CO₂ (g) + H₂ (g):        ΔH˚_{г =} + 1226 Btu/lb-mole 

H₂O (l) → H₂O (v): ΔH_v = + 18,935 Btu/lb-mole

(b) CO (g) + ½ O₂ (g) → CO₂ (g):       ΔH˚_г = —121,740 Btu/lb-mole 

H₂ (g) + ½ O₂ (g) → H₂O (v): ΔH˚_г = —104,040 Btu/lb-mole