A sample of methane of mass 4.50 g occupies 12.7 dm 3 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...

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.