A rigid ( ie. Constant volume), non-conducting ( ie. Perfectly insulated, no heat losses or gain) tank with a volume of 3.3 m^3. The tank is divided into two unequal parts by a thin membrane. One side of the membrane representing 1/3 of the tank is filled with nitrogen ( may be assumed to be an ideal gas) at 4.1 bar and 315.6 K. The other side of the membrane is evacuated. The membrane ruptures and the gas fills the entire tank. Heat capacity of nitrogen, Cp=3.5 R.