A 2m^3 rigid tank initially contains air at 100kpa and 22 degree C. The tank is connected to a supply line through valve, air is flowing in the supply line at 600kpa and 22 degree C. The valve is opened and the air is allowed to enter the tank until the pressure of the tank reaches 600kpa. During the process, the tank is also losing heat to the heat to the environment. The air temperature in the tank at the final state is 77 degree C. Determine (a) the mass of air that has entered to the tank; (b) the amount of heat loss during the process.