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2A.4(b) A sample consisting of 2.00mol He is expanded isothermally at 0 °C from 5.0dm3 to...

2A.4(b) A sample consisting of 2.00mol He is expanded isothermally at 0 °C from 5.0dm3 to 20.0dm3 (i) reversibly, (ii) against a constant external pressure equal to the final pressure of the gas, and (iii) freely (against zero external pressure). For the three processes calculate q, w, and ?U

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