What is the mass fraction of the solute if it is known that 80 g of the solution contains 20 g of salt?
| March 17, 2021 | education
The mass fraction of the solute is calculated by the formula:
W (in-va) = m (in-va) / m (solution) • 100%.
From the condition of the problem, the mass of salt is 20 g, and the mass of the solution is 80 g, which means the percentage concentration of salt in the solution:
W (salt) = 20/80 • 100% = 25%.
Accordingly, the mass of water in solution is:
m (H2O) = 80 – 20 = 60 g.
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