A 1.0 cubic meter rigid tank has nitrogen at 600 kPa, 400 K. A valve is opened and 0.5 kg of the gas is allowed to flow out. The valve

is closed and the temperature of the gas in the tank is observed to be 375 K 1. Determine the amount of mass that was present in the tank at the beginning. 2. Determine the specific volume of the gas in the tank at the beginning. 3. Determine the pressure in the tank after the valve was closed. 4. Determine the specific volume of the nitrogen in the tank after the valve was closed. 1. List the assumptions you needed to make in order to solve this problem