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the heat of reaction of methane (ch4) is determined in a constant pressure calorimeter by burning the gas as a very weak mixture. the gas flow rate is 70 l/h, and the mean gas temperature (inlet to outlet) is 25 c. the temperature rise of the cooling water is 1.8 c, with a water flow rate of 5 kg/min. calculate the higher and lower heats of reaction at constant volume and constant pressure in kj/