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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 toV

(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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