A solution is prepared by adding $2$ g of substance $A$ to $18$ g of water. The mass percent of the solute is:

10

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20

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40

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25

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Solution

The correct option is D $10$
The formula for the mass percentage of solute in solution is $= \frac{M a s s o f s o l u t e}{m a s s o f s o l u t i o n} \times 100$
Substituting values in the above expression, we get
Mass percentage $= \frac{2}{2 + 18} \times 100 = 10$ %

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