The mole fraction of the solute in one molal aqueous solution

0.027

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0.036

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0.018

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0.009

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Solution

The correct option is C 0.018
1 molal aqueous solution means, 1000 g of water contains 1 mole of the solute.
$∴$ Mole fraction of solute = $\frac{m o l e s o f s o l u t e}{m o l e s o f s o l u t e + m o l e s o f w a t e r} = \frac{1}{1 + \frac{1000}{18}} = 0.018$

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