An ideal gas, enclosed in a cylinder with a piston, has a pressure and volume of 12 m^3 and 4*10^5 Pa, respectively, at a temperature of 30 K. The external pressure is equal to 4*10^5 Pa (R = 8.315 K mole). The gas is heated up slowly to 70 K with the piston allowed to freely move. Describe very briefly the nature of the process. Determine the final values of pressure, volume, and temperature at the end of the process. Draw accurately the process in V-P, T-P, and V diagrams. Calculate the total work done by the system in this process.