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the answer is 20.12 kJ but i dont know haw to do it 7. ( 10 points) A piston cylinder contains 2kg of saturated liquid

the answer is 20.12 kJ but i dont know haw to do it

7. ( 10 points) A piston cylinder contains 2kg of saturated liquid R134a at temperature =4C. It is heated until half the mass vaporizes. The boundary work done by the system is closest to

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