Question

Calculate the mass percent (m/m) of a solution prepared by dissolving 59.56 g of nacl in 165.1 g of h2o. express your answer to four significant figures.

Answer 1

The general formula for mass percent of a solution is:

% m/m = [grams of solute] / [grams of solution] * 100

And grams of solution = grams of solute + grams of solvent.

So, in our problem:

Solute = NaCl => mass of solute = 59.56 g

Solvent = H2O => mass of solvent = 165.1 g

=> mass of solution = 59.56 g + 165.1 g = 224.66 g

=> % m/m = [59.56 / 224.66] * 100 = 26.51 g (using four significant figures).

Answer: 26.51%