The entropy change for the isothermal reversible expansion of an ideal gas at 300 K from a particular state A to a state B is 500 J/K. Calculate the work (in kJ) obtained in the process.

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Δ S = n R ln V 1 ​ V 2 ​ ​ = 500 W = − n RT ln ( V 1 ​ V 2 ​ ​ ) = − 300 × 500 × 1 0 − 3 k J = − 150 k J Work obtained = 150 k J

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