The heat of combustion of ethanol into carbon dioxide and water is –327 kcal at constant pressure. T — Thermodynamics and Thermochemistry Chemistry Question

Question

The heat of combustion of ethanol into carbon dioxide and water is –327 kcal at constant pressure. The heat evolved (in cal) at constant volume and 27ºC (if all gases behave ideally) is (R = 2 cal mol K ) ………… . –1 –1