Question

A solution is prepared by adding 2 g of a substance A to 18 g of water. Calculate the mass percent of the solute.

Answer 1

Mass percent of A = \(\frac{Mass\,of\,A}{Mass\,of\,solution}\) x 100

= \(\frac{2\,g}{2\,g\,of\,A+18\,g\,of\,water}\) x 100

= \(\frac{2\,g}{20\,g}\) x 100

= 10%