A solution contains $1.5$ moles of sugar and $18.5$ moles of a solvent. Hence the mole fraction of the solute is:

0.081

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0.075

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0.085

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0.065

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Solution

The correct option is B $0.075$
A solution contains 1.5 moles of sugar and 18.5 moles of a solvent. Then the mole fraction is given as:

$X_{s o l u t e} = \frac{n_{s o l u t e}}{n_{s o l u t e} + n_{s o l v e n t}}$

$= \frac{1.5}{1.5 + 18.5}$

$= \frac{1.5}{20}$

$= 0.075$

Hence, the correct option is $B$

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