What mass of 0.5 motal urea solution contain 0.15 mole urea?

300 g

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309 g

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327 g

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353 g

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Solution

The correct option is B 309 g
$M o l a l i t y = \frac{M o l e s (s o l u t e)}{M a s s o f s o l v e n t (k g)}$
$⟹ 0.5 = \frac{0.15}{M_{s o l v e n t}}$
$⟹ M_{s o l v e n t} = 0.3$ $k g$
Mass of urea $= 0.15 \times 10 = 9$ $g m$
Mass of solution $= 300 + 9 = 309$ $g m$

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