You are making "Stargon" welding gas (75% argon/25% carbon dioxide by mass).
The tank has a volume of 0.2 cubic meters and is initially charged with argon. The argon is at room temperature (298K) . A carbon dioxide pipeline at 1000 psia and 300K is used to pressurize the tank to 1000 psia. Assume adiabatic filling and assume the tank is rigid.
a) What is the initial pressure of the argon (before filling)?
b) What is the tank temperature at the end of the filling process(as soon as the tank reaches 1000psia)?
c) After the tank is filled, the valve is closed and the tank has a heat transfer with the room until it is at room temperature. What is the tank pressure once it reaches room temperature?
d) How much heat transfer occurred?
e) What is the entropy generation for the filling process?
f) What is the tank's change of entropy due to heat transfer to the room?
g) What is the room's change of entropy due to the tank heat transfer?