12 g of salt was dissolved in 100 g of water. Determine the mass fraction of salt in the resulting solution.

H2O mass – 100 g.

Salt mass – 12 g.

Determine the mass fraction of salt in the resulting solution.

In order to solve this problem, first of all, you should write down the formula.

W = m r.v. / m r-ra * 100%.

Where W is the mass fraction.

m r.h. is the mass of the soluble substance.

m solution is the mass of the solution.

First of all, let’s determine the mass of the solution.

m solution = 12 + 100 = 112 g.

This means that the mass of the solution is 112 g.

Let’s calculate the mass fraction of salt in the solution.

W = 12/112 * 100 = 10.7%.

Answer: the mass fraction is 10.7%.