Question

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

Answer 1

Answer:

Mass percent of solute = mass of solutionmass of solute×100

Mass of solute = 2 g

Mass of solvent = 18 g

Mass of solution = 20 g

∴  Mass percent of solute =202×100

=10%

Answer 2

Explanation:

Mass per cent of A = $\frac{Mass~of~A}{Mass~of~solution}$ × 100

• $\sf\frac{2g}{2g~of~A~+~18g~of~water}$ × 100

• $\sf\frac{2g}{20g}$ × 100

• 10%

:. Mass per cent of A is 10 %