To 200 g of 8% sodium chloride solution was added 50 g of water. The mass fraction of salt in the resulting

To 200 g of 8% sodium chloride solution was added 50 g of water. The mass fraction of salt in the resulting solution is equal to ..

First, let’s calculate the mass of salt in the solution:
m (NaCl) = M solution * w (NaCl) = 200 * 0.08 = 16 (g)
Then we calculate the Mass of the new solution, for this we add the mass of water to the mass of the solution:
M solution = M solution + M water = 200 +50 = 250 (g.)
Now let’s calculate the mass fraction of salt in the new solution:
w (NaCl) = (m (NaCl) / M solution) * 100 = (16/250) * 100 = 6.4%
This means that the mass fraction of salt in the new solution is 6.4%.