200 g of a 16% salt solution was evaporated to half what the mass fraction of salt in the resulting salt solution had become.

The mass of the solution is 200 g.

Mass fraction is equal to – 16%.

Evaporated – by half.

Determine the mass fraction of salt in the resulting solution.

First, it is necessary to determine the mass of the salt in the solution. We use the following formula.

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

m (salt) = 16 * 200/100 = 32 g.

Therefore, the mass of salt in solution is 32 g.

Then they evaporated by half, therefore, the mass of the solution became 2 times less.

200: 2 = 100 g.

Let’s determine the mass fraction of salt.

W = 32/100 * 100 = 32%.

Answer: the mass fraction of salt is 32%.