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Pressure of 10 moles of an ideal gas is ...

Pressure of 10 moles of an ideal gas is changed from 2 atm to 1 at against constant external pressure without change in temperature. If surrounding temperature (300K) and pressure (1 atm) always remains constant then calculate total entropy change `(DeltaS_("system")+DeltaS_("surrounding"))` for given process.
[Given : ? n2 = 0.70 and R = 8.0 J/mol/K]

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