Question

Due to the force of attraction, volume of molecules cannot be neglected.why?

Answer 1

Answer:

If force of attraction between the molecules is negligible, van der Waals; equation (for one mole) will become

PV=RT+Pb

The van der Waals; equation (for one mole) is (P+

V

2

a

)(V−b)=RT

The force of attraction between the molecules is negligible. The term

V

2

a

can be neglected in comparison to P.

(P)(V−b)=RT

PV−Pb=RT

PV=RT+Pb

Note:

'a' is a proportionality constant called coefficient of attraction. It refers to the pressure correction. Its value depends on the nature of the gas. It corrects for the attractive forces present in a real gas in the van der Waals' equation.

The term

′

nb

′

refers to volume correction

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