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Calculate the change in total entropy of system and surroundings for a isothermal irreversible expansion of...

Calculate the change in total entropy of system and surroundings for a isothermal irreversible expansion of 1.9 mol of a perfect gas from 7.3 L to 18.4 L against a constant external pressure of 1.9 bar at 298 K.

Answer is 7.5 but I want to understand how to get to that answer.

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Answer #1

The complete calculation of the total change in entropy is given as below:-

It is given that, moles umben a moleg Cn) 9 Initi al volume Vi) =73L and Final vol ume Ve) = 18.4 L T and Presure ) simce, an(8.314 Jlmee.k)xImol x en AS 84L X 73L on AS 8.31ns2) = 7.68 J K AS =768 J) k Cchangein entoopy fon | mole) On Fon .9 mole a

So, the total change in entropy for 1 mole = 7.68 J/K and the total change in entropy for 1.9 mole = 14.6 J/K.

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