1. Oxygen initially is at 35°F and 16.8 lbf/in^2. It fills a closed, rigid 5 ft tank filled with a paddle wheel.During the process, a paddle wheel provides 4 Btu

of energy transfer by work to the gas. During the process, the gas temperature increases up to 90°F. Assuming ideal gas behavior and ignoring K.E and P.E effects, determine the mass of the oxygen in the tank, the amount of heat transfer in Btu, and the final pressure of the tank.