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Q.

$H_{3} {PO}_{4} (98 g per mol)$ is 98% by mass of solution. If the density is 1.8 gram/ml, the molarity is ____?

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answer is 18.

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Detailed Solution

$Molarity = \frac{(percentage by mass) \times 10 \times density}{gram molecular weight of solute} = \frac{98 \times 1.8 \times 10}{98} = 18$

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