derive the relationship between relative lowering of vapour pressure and molare mass of salute ?
Answers
Δ
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W2 g of solute of mass M2 be disolved in W1 g of solvent of molar mass M1
∵ hence
we can write a solution of number of moles of solute N1 & &number of moles of solute N2 are given us ,
The mole fraction of solute,
=
=
where , and p are the vapour pressures of solvent and solution respectively.
∴ Δ
=
=
For a dilute solutions ,
>>
∵ hence,
may be negleted in comparison with
∴ Δ
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