Question

Calculate the mass percentage of 15 ppm of chlorofom in water.

• A. $15\times {10}^{-4}$
• B. $15\times {10}^{-4}$
• C. $15\times {10}^{-2}$
• D. $15\times {10}^2$

Answer 1

The correct option is A $15\times {10}^{-4}$

15 ppm = $\frac{\text{mass of the solute}}{\text{mass of the solution}}\times {10}^6$

mass % = $\frac{\text{mass of the solute}}{\text{mass of the solution}}\times {10}^2$

Dividing the above equations, we get
$\frac{\text{mass \%}}{15}={10}^{-4}$
Hence, mass percentage = $15\times {10}^{-4}$