A potassium bromide solution is 8.30 % potassium bromide by mass and its density is 1.03 g/mL.

What mass of potassium bromide is contained in 41.2 mL of the solution?

3.52 g

3.32 g

5.11 g

3.42 g

3.52 g.

Explanation:

The density of potassium bromide solution is 1.03 g/mL, which means that the mass of 1.0 mL of the solution is 1.03 g.

Using cross multiplication:

1.0 mL of potassium bromide solution weigh → 1.03 g.

41.2 mL of potassium bromide solution weigh →? g.

∴ The mass of 41.2 mL of potassium bromide solution = (41,2 mL) (1.03 g) / (1.0 mL) = 42.436 g.

∴ The mass of potassium bromide in the solution = the mass of the solution x weight fraction of potassium bromide = (42.436 g) (0.083) = 3.52 g.