Question

Question 42
Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water?

Answer 1

In the given question, mass% of sodium sulphate solution = 20%
Mass of the solvent = 100 g
Let the mass of solute (sodium sulphate) = x g
$20=\frac{x}{x+100}\times 100$
$80x=2000$
$x=25$
Mass of sodium sulphate = 25 g