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Mole Fraction

How to determ...

Question

How to determine mole fraction of solvent when moles of solute and solvent are given?

A

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B

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C

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D

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Solution

The correct option is D

Mole fraction (X) is just the ratio of the number of moles of the required quantity to the sum of number of moles of all other quantities. We usually only have a solute and a solvent.

$∴ X_{s o l v e n t} = \frac{M o l e s o f s o l v e n t}{Moles of solute + Moles of solvent}$

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Similar questions

Q. The sum of mole fractions of solute and solvent of a solution is equal to :

Q. The vapour pressure of a solvent decreased by

10 m m

H g

when a non-volatile solute was added to the solvent. The mole fraction of solute in the solution is

0.2

. What would be the mole fraction of solvent if decrease in vapour pressure is

20 m m

?

P^{0}

P_{S}

are the V.P. of solvent and its solution respectively and

N_{1}

N_{2}

are the mole fraction of solvent and solute respectively then:

P_{o}

P_{s}

are the vapour pressures of the solvent and solution respectively,

n_{1}

n_{2}

are the mole fractions of the solvent and solute respectively, then:

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