Question
Calculate the concentration of HBr solution in mol L-1 in a sample which has density 1.5ml-1 and mass percent of HBr being 48%. [Molar mass of HBr = 81g mol-1]
✓
Answer
Mass of solute = 48g, Mass of solution = 100g,
Volume of solution $=\frac{\text{M}}{\text{d}}=\frac{100}{1.5}$
$\text{M}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}}\times\frac{1000}{\text{Volume of solution}}$
$=\frac{48\times1000}{81\times\frac{100}{1.5}}=8.8\text{mol L}^{-1}$
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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