A piston/cylinder arrangement of initial volume 0.025 m3 contains saturated water vapor at 200?C. The steam now expands in a quasi-equilibrium isothermal process to a final pressure of 200 kPa while it does work against the piston. Determine the work done in this process by a numerical integration (summation) of the area below the P-V process curve. Compute about 10 points along the curve by using the computerized software to find the volume at 200?C and the various pressures. How different is the work calculated if ideal gas is assumed?