Is this the way to calculate the bulk modulus using V. d. Waals-equation?

  • Thread starter tjosan
  • Start date
22
0
Hi,

Is this right?

(p+a(n/v)2)(V-nb)=nRT

Just differentiate both sides with respect to P?

If I do that I get

0=V+P*(dV/dP)t-nb-(an2)/V2*(dV/dP)t+2abn3/V3*(dV/dP)t

(dV/dP)t=(nb-V) / (P-n2a/V+2an3ab/V3)

And now to calculate the bulk modulus:

kt=-1/V*(dV/dP)t = -1/V * (nb-V) / (P-n2a/V+2an3ab/V3)

And one more questions:
What happens to the bulk modulus at the critical point? Is it equal to zero?
 

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