. A piston having 0.033 mol of gas at 35.0°C expands from 0.77 L to 2.00 L, and the system…

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. A piston having 0.033 mol of gas at 35.0°C expands from 0.77 L to 2.00 L, and the system simultaneously absorbs 155 J of heat. Calculate DU if the expansion occurs (a) against an external pressure of 0.455 atm, and (b) reversibly.