Two moles of an ideal gas at 2bar and 27°C expand isothermally against a constant pressure of 1 bar.The work done by the gas is
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External pressure is constant. It is irreversible isothermal expansion.
Work done=— external pressure× change in volume
W=- p2× (v2-v1)
W= -p2×(nRT/p2—nRT/P1)
W= -p2nRT×(1/p2—1/p1)
W= -1×2×0.0821×300×(1—1/2)
W= -246.3
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