Question

Derive critical constants in terms of van der waals constants.

Answer 1

The relationship between critical constants of the gases and their Van der Waal constants is as follows:

(i) Vc = 3b

(ii) Pc = a/27b2

(iii) Tc = 8a/27Rb

(iv) The critical compressibility factor Zc is given by,

formula of critical compressibility factor

These relations have been derived from the calculations based on Van der Waal's equation.