Hi. It's my first time posting here. I did a quick search, but I couldn't find any existing threads addressing my question, so here it is: Fe2O3 (s) + 3 C (gr) --> 4 Fe (s) + 3 CO2 (g) What is the ΔH of formation of CO2 (g) at 298 K if the following is true of the above reaction at 298 K: Keq = 5.80 x 10-53 ΔSorxn = 0.522 kJ/K ΔHoformation of Fe2O3 (s) = -795 kJ/mol I know that the correct answer is -114 kJ/mol, but I can't figure out how to get there. Here's what I've done so far: ΔGo = -RT lnK =-298kJ ΔGo = ΔHo -TΔSo ΔHo = -298kJ + (298K)(.522kJ/K) = -142.44 kJ -142.44kJ = 3ΔH (CO2) - 795 kJ 3ΔH (CO2) = 652.5 kJ ΔH (CO2) = 217.5 kJ Which obviously isn't the right answer, but I don't see where I went wrong. Anybody see what I don't?