MolSynapsequestion bank

MolSynapse / Question bank / Real Gases / van der Waals equation and its constants

NEET levelSingle correct optionDifficulty 1 of 3rg177

Which of the following is the correct form of the van der Waals equation for one mole of gas?

A $(P + \frac{a}{V _{m}^{2}}) (V_{m} - b) = RT$
B $(P - \frac{a}{V _{m}^{2}}) (V_{m} - b) = RT$
C $(P + \frac{a}{V _{m}^{2}}) (V_{m} + b) = RT$
D $(P + \frac{a}{V _{m}}) (V_{m} - b) = RT$

Answer: A

The observed pressure is increased by the attraction term

a / V_{m}^{2}

to give the ideal pressure, and the volume is reduced by the excluded volume

b

to give the free volume. The product of the corrected quantities equals

RT

.

Practice Real Gases More on van der Waals equation and its constants

Previous questionNext question

More questions on van der Waals equation and its constants