# A sample of methane of mass 4.50 g occupies 12.7 dm3 at 310 K. (a) Calculate the work done when the gas expands isothermally against a constant external pressure of 30.0 kPa until its volume has increased by 3.3 dm3 . (b) Calculatethe work that would be done if the same expansion occurred isothermally and reversibly.

A sample of methane of mass 4.50 g occupies 12.7 dm3 at 310 K. (a) Calculate the work done when the gas expands isothermally against a constant external pressure of 30.0 kPa until its volume has increased by 3.3 dm3 . (b) Calculate
the work that would be done if the same expansion occurred isothermally and reversibly.

(550 words)

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