What is the molarity of a $10 m L$ solution in which $3.7 g$ $K C l$ are dissolved?

0.05 M

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0.1 M

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1 M

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5 M

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10 M

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Solution

The correct option is C $5 M$
The molecular weight of $K C l$ is 74.6 g/mol.

The number of moles of $K C l$ $= \frac{3.7 g}{74.6 g / m L} = 0.05 m o l$ .

Volume of solution $= \frac{10 m L}{1000 m L / L} = 0.01 L$

Molarity $= \frac{0.05 M}{0.01 L} = 5 M$ .

Hence the correct option is D.

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