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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

10

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B

5

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C

0.833

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D

Can’t be determined

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Solution

The correct option is D Can’t be determined
We know that, $Molefraction=Moles of soluteMoles of solute + Moles of solvent$

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

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