Gas at constant T and P is contained in a supply line connected through a valve to aclosed tank containing the same gas at a lower pressure. The valve is opened to allowflow of gas into the tank, and then is shut again.
(a) Develop a general equation relating n1 and n2,the moles (or mass) of gas in the tank at the beginning and end of the process, to the properties U1 and U2, the internalenergy of the gas in the tank at the beginning and end of the process, and H',theenthalpy of the gas in the supply line, and to Q,the heat transferred to the materialin the tank during the process.