Air (an ideal gas) at 90ºF and 10 psia is contained in a horizontal cylinder by a frictionless piston. The piston is released, and the volume in the cylinder slowly increases from 1 to 3 ft3. Calculate the work done by the gas on the piston if: (a) the expansion occurs at constant internal pressure, and (b) the expansion occurs at constant internal temperature.   Im just not sure what equation i should use for a problem like this

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Introduction and Basic Calculations in Multiphase Systems

Chemical calculations involve material and energy balance calculations which enable engineers to calculate material and energy requirements in various chemical processes. In addition to this, chemical calculations help to study the behavior and properties of gases, liquids, and their mixtures.