The standard enthalpy of formation of liquid ethanol C2H5OH(l), is -227.63 kJ/mol. Calculate the heat of combustion at constant pressure and at constant volume of C2H5OH(l). ∆H°f,CO2 = -393.5 kJ/mol; ∆H°f,H2O = -285.4 kJ/mol.             C2H5OH(l) + 3 O2(g) à 2 CO2(g) + 3 H2O(l)

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