(Answered) A sample of 45g of methane occupies 123l at 305k calculate

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A sample of 4.5g of methane occupies 12.3L at 305K. Calculate the work done when the gas expands isothermically against a constant external pressure of 210 Torr until it's volume has increased by 3.5L, then calculate the work done if the expansion occurred reversibly.

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