2 mole of ideal gas at 27 degree celsius temperature is expanded reversibly from 2 litre to 20 litre. find entropy change (r=2 cal/mol k).

Hope you understand

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yes i understood thank u 
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thank u Mr soutik
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Bt how q=-w
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This is an isothermal process for which dU=0 We know that, dU=q+w 0=q+w .`. q=-w
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cccvvv
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