A certain gas has a molecular weight of 30.0, a critical temperature of 310 K, and a critical pressure of 4.5 MPa. Calculate the density in kg / m 3 kg/m3 of this gas at 465 K and 9.0 MPa (a) if the gas is ideal and (b) if the gas obeys the law of corresponding states

Explanation:

(a)  We know that,

or,           P =

                  =

                  = 69.8  

Hence, if the gas is ideal then its density is 69.8 .

(b)   It is known that,

                       =

                       = 1.5

                     =

                     = 2

Expression for the compressibility factor is as follows.

             Z =

                 = 0.84

  and,       P =

                    =

                    = 83.095

Therefore, if the gas obeys the law of corresponding states then its density is 83.095 .