A tank having a volume of 5.66 m³ (200 ft³) contains saturated water vapor at 138kPa (20psia). A line is attached to the tank in which vapor flows at 689 kPa (100 psia) and 478 K (400 F). Steam from this line enters the tank until the pressure is 689 kPa (100 psia). Calculate the mass of steam that enters the tank assuming that the process is adiabatic and that the heat capacity of the tank is negligible. Use the NIST software for properties.