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If Z is a compressibility factor, van der Waals equa- tion at low pressure can be written as:

$\begin{array}{1 1}(A)\;Z=1-\large\frac{Pb}{RT}\\(B)\;Z=1+\large\frac{Pb}{RT}\\(C)\;Z=1+\large\frac{RT}{Pb}\\(D)\;Z=1-\large\frac{a}{VRT}\end{array} $

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The van der Waals equation of state
At low pressure, $V_m -b \approx V_m$ , the equation reduces to
$\Rightarrow PV_m+\large\frac{a}{V_m}$$=RT$
Hence (D) is the correct answer.
answered Apr 7, 2014 by sreemathi.v

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