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  3. Chemistry
  4. When HCl gas is passed into water, it gives a solution which contains 30 % HCl by mass. The density of the resultant solution is 1.095 g mL -1. The molarity of the solution is M.

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Q. When $HCl$ gas is passed into water, it gives a solution which contains $30 \% HCl$ by mass. The density of the resultant solution is $1.095\, g\, mL ^{-1}$. The molarity of the solution is_______ $M$.

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Solution:

$30 \% HCl$ by mass means $30\, g$ of $HCl$ in $100\, g$ of solution.
The density of the solution is $1.095\, g\, mL ^{-1}$.
Hence, the volume of the solution $=\frac{100}{1.095}$
$=91.32\, mL$
Molarity $=\frac{30 \times 1000}{36.5 \times 91.32}=9\, M$