A 5-ft3 rigid tank initially contains refrigerant-134a at 60 psia and 100 percent quality. The tank is connected by a valve to a supply line that carries refrigerant-134a at 140 psia and 80°F. The valve is now opened, allowing the refrigerant to enter the tank, and is closed when it is observed that the tank contains only saturated liquid at 100 psia. Determine
(a) The mass of the refrigerant that entered the tank,
(b) The amount of heat transfer with the surroundings at 70°F, and
(c) The entropy generated during this process.