20 g of salt was dissolved in 100 g of water. Determine the mass fraction of the resulting solution.
| April 11, 2021 | education
The mass of water is equal to – 100 g.
The mass of salt is equal to – 20 g.
In this task, it is necessary to determine the mass fraction of a substance. Apply the following formula to solve.
W = m r.v / m r-ra * 100%.
Where W is the mass fraction of a substance in a solution.
m solution is the mass of the solution.
m r.h. – the mass of the solute.
For this, it is necessary to determine, first of all, the mass of the solution. In order to determine the mass of the solution, it is necessary to add the mass of water and the mass of the substance.
m solution = 100 + 20 = 120 g.
Next, let’s substitute the known values into the formula.
W = 20/120 * 100 = 16.7%.
Answer: W = 16.7%.
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