A well-insulated piston-cylinder assembly is connected by a valve to an air supply line at 8 bar. Initially, the air inside the cylinder is at 1 bar, 300 K, and the piston is located 0.5 m above the bottom of the cylinder. The atmospheric pressure is 1 bar, and the diameter of the piston face is 0.3 m. The valve is opened to and the air is admitted slowly until the volume of the air inside the cylinder has doubled. Calculate the work done in kJ and the final mass in kg of the air inside the cylinder for a supply temperature of 300K.