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Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistrySome Basic Concepts of Chemistry3 Marks
Question
Calculate the concentration of HBr solution in $\mathrm{mol} \mathrm{~L}^{-1}$ in a sample which has density $1.5 \mathrm{ml}^{-1}$ and mass percent of HBr being $48 \%$. [Molar mass of $\left.\mathrm{HBr}=81 \mathrm{g} \mathrm{~mol}^{-1}\right]$
✓

Answer

Mass of solute = 48g, Mass of solution = 100g,
Volume of solution $=\frac{\text{M}}{\text{d}}=\frac{100}{1.5}$
$\text{M}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}}\times\frac{1000}{\text{Volume of solution}}$
$=\frac{48\times1000}{81\times\frac{100}{1.5}}=8.8\text{mol L}^{-1}$

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