Methanol, ethanol, and n-propanol are three common alcohols. When 5.00 g of each of these alcohols is burned in air, heat is liberated. Calculate the heats of combustion of these alcohols in kJ/mol.
(a) methanol (CH3OH), -22.6 kJ
(b) ethanol (C2H5OH), -29.7 kJ
(c) n-propanol (C3H7OH), -33.4 kJ