please write all steps clearly and integrate the equation dont just put it show all steps

A horizontal piston/cylinder arrangement is placed in a constant-temperature bath. An external force holds a frictionless piston in place against an initial gas pressure of 14bar. The initial gas volume is 0.03m3. The external force on the piston is reduced gradually, and the gas expands isothermally as its volume doubles. If the volume of the gas is related to its pressure so that the product PV is constant: a) What is the work done by the gas in moving the external force? b) How much work would be done if the external force were suddenly reduced to half its initial value instead of being gradually reduced