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Q.

Calculate the mass percentage of water in 10% ${KNO}_{3}$ solution.

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answer is 90.

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Detailed Solution

Mass of ${KNO}_{3} = 10 g$ ,

Mass of water $= 100 - 10 = 90 g$

$∴$ Mass percent of water $= \frac{90 (g)}{10 g + 90 g} \times 100 = 90 %$

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