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  4. The density of 10.0 % by mass KCl solution in water is 1.06 g cm -3 . Its molarity is

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Q. The density of $10.0 \%$ by mass $KCl$ solution in water is $1.06\, g \,cm ^{-3} .$ Its molarity is

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Solution:

Mass of 1 litre solution $=1000 \times 1.06=1060 \,g$

Amount of $KCl$ in solution $=1060 \times \frac{10}{100}=106 \,g$

Molarity $=\frac{106}{74.5} \times \frac{1000}{1000}=1.42\, M$