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A sample consisting of 2.00 mol He is expanded isothermally at 22 degrees C from 22.8 dm3 to 31.7 dm3

(a) reversibly, (b) against a constant external pressure equal to the final pressure of the gas, and (c) freely (against zero external pressure). For each of these three processes, calculate q, w, ?U and ?H (all in SI units).

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