Question

In van der Waals gas equation, the volume occupied by the gas molecules is given by the term

an²/V²

P+ an²/ V²

(V - nb)

nb​

Answer 1

OPTION A is thr ryt ans

Answer 2

Van der Waals explain the behaviour of the real gases. It is the modification of the ideal gas equation.

Explanation:

• Van der Waals equation is derived from ideal gas equation: $PV= nRT$.
• The modification of the ideal gas equation was done by considering the volume of the gas molecules and the force of attraction between them.
• The equation is for 1 mole of gas:-$(P + \frac{a}{v^{2} } )(V-b) =RT.$
• For n mole of gas:- $(P+ \frac{an^{2} }{V^{2} } )(V- nb) = nRT.$
• The 'a' and 'b' are constants and are called van der Waals constants.
• In the equation, volume correction is $V- nb$.
• The corrected pressure is$P +\frac{an^{2} }{V^{2} }$.

So, the correct answer is option 3.