Irreversible and isothermal work

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cns
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I know work for reversible + isothermal is w=nRTln(v2/v1) but what about irrev? I see the equation W=P(delta V) used all the time. Is this the correct one to use? or is there another equn for irreversible work for a gas?

THanks
 

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Due to irreversibility you would get entropy generation which would take away from the useful work output. You might need to subtract the effect of the entropy generation.
 

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