1. The problem statement, all variables and given/known data The standard enthalpy of formation for liquid water is: H2 = 1/2O2→H2O ΔHf=-285.8 kJ/mol Which of the following could be the standard enthalpy of formation for water vapor? (A) -480.7 kJ/mol (B) -285.8 kJ/mol (C) -241.8 kJ/mol (D) +224.6 kJ/mol 2. Relevant equations NA 3. The attempt at a solution The equation above shows that condensation occurs, which is an exothermic process giving a negative ΔH. Perhaps I am not understanding the question because how can the standard enthalpy of formation of water vapor be determined from the above equation?