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4. The initial state of one mole of a monatomic ideal gas is P=20 atm and T=300K. Calculate the change in the entropy of the

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4. The initial state of one mole of a monatomic ideal gas is P=20 atm and T=300K. Calculate the change in the entropy of the gas for (a) an isothermal decrease in the pressure to 10atm, (b) a reversible adiabatic expansion to a pressure of 10atm. (10 points)

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