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A sample of 0.28 mol of methane occupies 12.7L at 21C. Calculate the work done when the gas expands isothermally against a constant external pressure...

A sample of 0.28 mol of methane occupies 12.7L at 21°C.
Calculate the work done when the gas expands isothermally against a constant external pressure of 27 kPa until its volume has increased by 3.3L. Calculate the work that would be done if the expansion
occurred reversibly.

1. 101.325 kPa = 1 atm. Pressure
1 kPa =1/101.325
27kPa =1/101.325 × 27 atm. w= P dV
Where, P is pressure, dV is change in volume and w is work done.
= 27 × 1/101.325 × 3.3
=0.879 joule...

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