Find the mass fraction of sugar in the solution if 170 g of sugar was dissolved in 500 g of water.

Given:
m (H2O) = 500 g
m (sugar) = 170 g
To find:
W (sugar) -?
Decision:
The mass fraction of a substance is found by the formula:
W (substance) = m (substance) / m (solution) x 100%
The solution consists of water and a solute, based on this we find the mass of the solution:
m (solution) = 500 g + 170 g = 670 g
We substitute the known values into the formula and find the mass fraction of sugar:
W = 170g / 670g x 100% = 25.37%