7 g of the substance was dissolved in 18 g of water. Determine the mass fraction of the substance in the solution.
| July 23, 2021 | education
The mass fraction of the solute is calculated according to the formula:
W (in-va) = m (in-va) / m (solution) • 100%.
Determine the mass of the solution:
m (solution) = m (water) + m (water) = 7 + 18 = 25 g.
The mass fraction of the substance in the solution is.
W (in-va) = 7/25 • 100% = 28%.
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