Calculate the heat of formation hof of pentane given that, Ask an Expert

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Pentane, C_5H_12, is a hydrocarbon that is commonly used as a fuel for solvent. a) Write a balanced chemical equation for the complete combustion of pentane. C_5H_12+8O_2-->5CO_2+6H_2O b) Calculate the volume of air at 26 degrees Celsius and 0.99 atmosphere that is needed to burn completely 14.34 grams of pentane. Assume that air is 21.0 percent O_2 by volume. c) When 1 mol of pentane is reacted with pure oxygen, O_2, -191 kJ of heat is released. Calculate the heat of formation, Hof, of pentane given that the Hof of H_2O(l) is -285.3 kJ mol-1 and Hof of CO_2(g) is -393.5 kJ mol-1. (Note: I expect you to calculate the Hof of pentane from the data in this problem.)

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