The mass density of water vapour at 327.6 atm and 776.4 K is 133.2 kg m-3. Given

Question:

The mass density of water vapour at 327.6 atm and 776.4 K is 133.2 kg m-3.
Given that for water Tc = 647.4 K, Pc = 218.3 atm, a = 5.464 dm6 atm mol-2, b= 0.03049 dm3 mol-1, and M= 18.02 g mol-1, calculate
(a) The molar volume. Then calculate the compression factor
(b) From the data,
(c) From the virial expansion of the van der Waals equation.