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Calculate the energy required to change the temperature of 3.00 kg of ethane (C2H6) from 25.0°C to 73.9°C in a rigid vessel. (Cv for C2H6 is 44.60 J K-1 mol-1.)

Calculate the energy required for this same temperature change at constant pressure.

Calculate the change in internal energy of the gas in each case of these processes.

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