17. The tank shown below initially contains 0.7 lbm of N at 950 R and an adiabatic, weightless, volumeless, and frictionless piston. The 7 ft tank is connected to a source of air at 950 R and 100 psia. Air enters the tank, forcing the piston up, until the air temperature is 1000 R and the final mass of air is 0.35 lbm. Calculate the total entropy generation for the process (Btu/R) assuming that there is 8 Btu of heat transfer from the N to the surroundings at 80 F. SGEN = 0.025 Btu R N qout Air pas