What would be the pressure of (Oxugen) if the temperatyure is 175K and 0.0450 m3/kg based on the following:

1. ideal gas law

2. van der waal's EOS

note: van der Waals, a = 27R2Tc2/64Pc, b = RTc/8Pc

3. The truncated virial equation

always note the following: Z = PV/RT = 1 + BP/RT, with a value of B from the generalized Pitzer corr