Saturated isobutane vapor at 320 K is contained in a piston-cylinder assembly. It is expanded to 3 bar by a reversible isothermal process. At 320 K, the vapor pressure of isobutane is 6.243 bar. Using the truncated virial equation of state, i.e. with the second virial coefficient,
a) Estimate the molar volume of isobutane at the initial and final states. (b) Determine the work done during the expansion process.
b) Determine the work done during the expansion process.