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The sign of the heat of formation matters. Using hess's law: 2(-238kJ) + 4(242kJ) + 2(393)= -1279=Heat of reaction Heat of combustion of methanol is just the heat of reaction divided by the molar coefficient for methanol in the chemical equation so about -639.5kJ/mol. In acuality it is somewhere near -727kJ/mol.
(c) The heat of combustion of propane is -2,220.1 kJ/mol. Calculate the heat of formation, ïHfï°, of propane given that ïHfï° of H2O(l) = -285.3 kJ/mol and ïHfï° of CO2(g) = -393.5 kJ/mol.(d) Assuming that all of the heat evolved in burning 60.0 grams of propane is transferred to 8000 grams of water (specific heat = 4.18 J/g.alculate the heat of formation, ïHfï°, of propane given that ïHfï° of H2O(l) = -285.3 kJ/mol and ïHfï° of CO2(g) = -393.5 kJ/mol. (d) Assuming that all of the heat evolved in burning 60.0 grams of propane is transferred to 8000 grams of water (specific heat = 4.18 J/g.