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Molality

7.45 g of pot...

Question

7.45 g of potassium chloride is dissolved in 100 g of water. What will be the molality of the solution?

A

1 m

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B

2 m

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C

2.4 m

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D

3 m

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Solution

The correct option is A 1 m
Mass of KCl = $7.45 g$

Molecular wt of KCl= $39 + 35.5 = 74.5 g$

Moles of KCl = $\frac{7.45}{74.5} = 0.1$

Molarity = $\frac{m o l e s}{m a s s o f s o l v e n t (i n k g)}$ = $\frac{0.1}{100 \times 10^{- 3}}$ = $1 m$

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