# One mole of an ideal monoatomic gas expands isothermally against constant external pressure of 1 atm from initial volume of 1L to a state where its fi

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One mole of an ideal monoatomic gas expands isothermally against constant external pressure of 1 atm from initial volume of 1L to a state where its final pressure becomes equal to external pressure. If initial temperature of gas is 300K then total entropy change of system in the above process is:
[R=0.082L atm mol^(-1) K^(-1)-=8.3J mol^(-1) K^(-1)]

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(Delta S)_(T) = nRT ln. (v_(2))/(v_(1)) = nR ln. (P_(1))/(P_(2)) for an ideal gas, PV = RT Given P_(1) xx 1 = R xx 300 " & " P_(2) = 1 atm

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