A 2-m^3 rigid tank contains refrigerant-134a vapor at 1.4 MPa, 180C. Determine the mass of the refrigerant in kilogram using:
a. the ideal gas law.
b. the real gas law.
c. the van der Waals equation of state.
d. the refrigerant-134a table.
e. what is the percent error if ideal gas law is used?