1. The problem statement, all variables and given/known data 2. Relevant equations Hess' Law 3. The attempt at a solution C2H4 (g) + H2O (g) -> C2H5OH (g) ΔH = - 46 kJ C2H5OH(g) -> C2H5OH(l) ΔH = - 43 kJ I think the ΔH is - 46 - 43 = - 89 However, the book says that the answer is A. +3 kJ How come that be?