Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure o

Question

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is (Given that 1 L bar = 100 J)

Accepted Answer

Work done $W_{irr} = -P_{ext} \Delta V = -2 	ext{ bar} 	imes (0.25 - 0.1) 	ext{ L} = -2 	imes 0.15 	ext{ L-bar} = -0.30 	ext{ L-bar} = -0.30 	imes 100 	ext{ J} = -30 	ext{ J}$.

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