Barium chloride weighing 6 grams was dissolved in 250 ml. Water (the density of water is taken

Barium chloride weighing 6 grams was dissolved in 250 ml. Water (the density of water is taken as 1 gram per milliliter) which is equal to the mass fraction in the resulting solution.

The mass of water taken to prepare the solution:

m (H2O) = p (H2O) * V (H2O) = 1 * 250 = 250 (g).

The mass of the resulting barium chloride solution:

m.-pa (BaCl2) = m (BaCl2) + m (H2O) = 6 + 250 = 256 (g).

Mass fraction of barium chloride in the resulting solution:

w (BaCl2) = (m (BaCl2) / mp.-pa (BaCl2)) * 100 = (6/256) * 100 = 2.34 (%).