Calculate the mass of water evaporated from 5 kg of 5% salt solution, if the mass fraction

Calculate the mass of water evaporated from 5 kg of 5% salt solution, if the mass fraction of salt in the solution has become equal to 10%.

1. Calculate the mass of salt in the original solution:

m (salt) = wout (salt) * mout (solution) = 0.05 * 5000 = 250 g;

2. Let the mass of the evaporated water from the solution be x g, we determine the mass of the remaining in the solution:

mmost (solution) = mout (solution) – misp (H2O) = 5000 – x;

3. Let us express the mass fraction in the solution remaining after evaporation:

wnov (salt) = m (salt): bridge (solution);

0.1 = 250: (5000 – x);

500 – 0.1x = 250;

0.1x = 250;

x = 2500 g.

Answer: 2500 BC