Write the expression for the work done by 1 mole of the gas in each of the following cases:
Write the expression for the work done by 1 mole of the gas in each of the following cases:
(i) For irreversible expansion of the gas from V1 toV2
(ii) For reversible isothermal expansion of the gas from V1 toV2.
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(i) Irreversible expansion takes place when external pressure is constant
Wirr = – Pext(V2 – V1) = – PextΔV
(ii) Reversible expansion takes place when internal pressure is infinitesimally greater than external pressure at every stage Wrev = -nRTln(V2/V1)
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