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Published on: August 13, 2026
Explain the physical significance of van der waals parameters.
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Significance of constant ‘b’. The constant ‘b’ is called co-volume or excluded volume per mole of a gas. Its units are litre mol –1 The volume of ‘b’ is four times the actual volume of the molecules.
Significance of constant ‘a’. The value of constant ‘a’ gives the idea of magnitude of attractive forces between the molecules of the gas. Its units are atm L 2 mol –2 . Larger the value of a, larger will be the intermolecular attraction among the gas molecules.
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