Physical Chemistry Real gases Critical data and equations of state Substitution of(8.15 )and(8.16)into(. 14 36 mc (8.15 8a (8.16 27R6 a 27b2 (8.17 Three equations for two parameters. a and b RT 27R2T2 a 8P 64P vdW gas (8.18)Critical data and equations of state Substitution of (8.15) and (8.16) into (8.14) Three equations for two parameters, a and b 2 27b a Pc = (8.16) V b m c 3 , = (8.15) Rb a Tc 27 8 = (8.17) c c P R T a 64 27 2 2 = (8.18) c c P RT b 8 = vdW gas Physical Chemistry Real Gases