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derive the equation of crictical constant from vanderwaal's constants in short method

vander Waal's equation for one  mole of gas,

----------> (1)

At critical point T = Tc, P = Pc and V =Vc
V = Vc
V - Vc = 0
V3 - 3V2Vc + 3VVc2 - Vc3 = 0
This equation is identical with vander Waal's equation(ie cubic equation in V)
Equating the both cubic equations'


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