Find the critical constants of HCL?

The van der Waals constants for HCL are a = 3.67 atm-liter2mole-2, and b= 40.8 cc mole-1. Find the critical constants of this substance.

Answer:
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CRITICAL TEMPERATURE

Tc= 8a/27Rb
Tc = 8*3.67/27*8.314
Tc = 0.31079 K

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CRITICAL PRESSURE

Pc = a/27*b*b
Pc = 3.67/27*40.8*40.8
Pc = 0.00008165 atm


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CRITICAL VOLUME

Vc= 3b
Vc = 3*40.8
Vc= 12.24 L

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