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Mole Fraction

A solution A ...

Question

A solution A has 10 gm of solute B dissolved in 2 moles of solvent. What is the mole fraction of the solute?

A

0.833

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B

10

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C

5

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D

can't be determined

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Solution

The correct option is D
can't be determined

Mole fraction of solute cannot be determined because the structural formula of B is not known. So, the number of moles of B cannot be found.

$∴(Mole fraction)solute=Moles of soluteMoles of solute+moles of solvent$

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