If 25 grams of sodium chloride is completely dissolved in 175 grams of water to form a solution, what is the concentration of the solution in mass percent?

20 per cent

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25 per cent

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12.5 per cent

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10 per cent

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Solution

The correct option is C
12.5 per cent

$C o n c e n t r a t i o n = \frac{M a s s o f S o l u t e}{M a s s o f S o l v e n t + M a s s o f S o l u t e} \times 100$
$\to C o n c e n t r a t i o n = \frac{25}{175 + 25} \times 100$
$\frac{25}{200} \times 100 = 12.5 p e r c e n t$

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If 25 grams of sodium chloride is completely dissolved in 175 grams of water to form a solution, what is the concentration of the solution in mass percent?

The correct option is C 12.5 per cent Concentration =Mass of SoluteMass of Solvent + Mass of Solute×100 →Concentration =25175+25×100 25200×100=12.5 per cent

The correct option is C
12.5 per cent

$C o n c e n t r a t i o n = \frac{M a s s o f S o l u t e}{M a s s o f S o l v e n t + M a s s o f S o l u t e} \times 100$
$\to C o n c e n t r a t i o n = \frac{25}{175 + 25} \times 100$
$\frac{25}{200} \times 100 = 12.5 p e r c e n t$