please solve the question step by step with good explanation !

The figure below shows a gas sample placed in a cylinder with a frictionless moving piston. The piston has a surface area. of 150cm2. When energy is supplied to the gas, expansion occurs and work is done. The piston moves 16cm and presses against a constant pressure of 1.0105Pa. a) is this an open or closed system? b) Sketch the PV diagram of this process. c) Calculate the work done by the gas