Question: A sample containing 2.0 moles of He is expanded from 22.8 to 31.7 dm3 at 22deg C (isothermally) against zero external pressure. Calculate Q,

A sample containing 2.0 moles of He is expanded from 22.8 to 31.7 dm3 at 22\deg C (isothermally) against zero external pressure. Calculate Q, W, \Delta U and \Delta H. Do the parameters change if the expansion occurs reversibly or against constant external pressure?

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