... 2,3,4-Trimethylpentane -51 .9 C 9 H20 3,3-Diethylpentane -55.7C 9 H20 2,2,3,3-Tetramethylpentane -56.7C 9 H20 2,2,3,4-Tetramethylpentane -56.6 C 9 H20 2,2,4,4-Tetramethylpentane -57.8C 9 H20 2,3,3,4-Tetramethylpentane ... respectively, calculate the heat of formation of benzene. (+ 49 kJ/mol) CALORIMETRY 10. A quantity of 1.435 g of naphthalene (C10H8) was burned in a constant-volume bomb calorimeter. Consequently, ... go to completion. 1 L.atm = 101.325 J (7. 39 x 103J = 7. 39 kJ, ΔU = -331 .9 kJ) Formula Name ΔHf (kcal/mol)H2 Hydrogen 0.0CH4 Methane -17 .9 C2H6 Ethane -20.0C3H8 n-Propane...