280 mmol of an ideal gas occupy 12.7 L at 310 K. Calculate the work done when gas expands a) isothermally against constant external pressure 0.25 atm, b) isothermally and reversibly e) in a vacuum until its volume becomes 3.3 L. Given: n = 280 mmoles = 0.280 mol, V1 = 12.7 L, AV = 3.3 L, T = 310 K, R = 8.314 JK' mol1. External Pressure = 0.25 atm To Find: Work done =?

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