3
Question
Under isothermal conditions, 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 1L.bar=100J]
Under isothermal conditions, 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 1L.bar=100J]
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Solution
The correct option is B −30 J
Expansion of a gas against a constant external pressure is an irreversible process. The work done in an irreversible process
W=−PextΔV=−Pext(V2−V1)=−2(0.25−0.1)
W=−2×0.15 L bar=−0.30×100 J=−30 J
Expansion of a gas against a constant external pressure is an irreversible process. The work done in an irreversible process
W=−PextΔV=−Pext(V2−V1)=−2(0.25−0.1)
W=−2×0.15 L bar=−0.30×100 J=−30 J
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