Question

If V is the observed molar volume of real gas and $V_{id}$ is the molar volume of an ideal gas then Z is___.

• A. $\overline{V}{\overline{V}}_{id}$
• B. $\frac{\overline{V}}{{\overline{V}}_{id}}$
• C. $\frac{{\overline{V}}_{id}}{\overline{V}}$
• D. $\frac{{\overline{V}}^2}{{\overline{V}}_{id}}$

Answer 1

The correct option is B

$\frac{\overline{V}}{{\overline{V}}_{id}}$

By definition, Z = $\frac{V_{observed}}{V_{ideal}}$

Alternatively , For ideal gas :

$\frac{P{V}_{id}}{RT}$ =1

$V_{id}=\frac{RT}{P}$

For real gas :

PV =RT

$\frac{PV}{RT}$ =Z

$\frac{V}{V_{id}}$ =Z