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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


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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