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Air with a mass of 3 kg is heated at a constant volume from a temperature of 25C to 80C. The process then takes place

Air with a mass of 3 kg is heated at a constant volume from a temperature of 25C to 80C. The process then takes place at constant pressure so that the gas has a temperature of 150C. Determine the heat required and the entropy changes that occur during the process. (Air: Cp =1,005 kJ/kg. K and = 1.4; and assume Cp does not change against temperature)

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