(Answered) Question on free expansion3 moles of an ideal gas undergo

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Question on free expansion:

3 moles of an ideal gas undergo an expansion from a volume of 20 liters to a volume of 30 litres (1L = 0.001 m^3 ). The temperature of the initial and final states are both 20?C

(a) Calculate the entropy change of the gas if this process is a reversible isothermal expansion

(b) Calculate the entropy change of the universe if this process is a reversible isothermal expansion

(d) Calculate the entropy change of the universe if this process is an irreversible free expansion.

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