Salt with a mass of 10 g was dissolved in water weighing 140 g. What is the mass fraction of salt in the solution?

To find the mass fraction of a substance in a solution, use the formula:

W (in-va) = m (in-va) / m (solution) • 100%.

Find the mass of the solution:

m (solution) = m (in-va) + m (water) = 10 + 140 = 150 g.

The percentage of salt in the solution:

W (salt) = 10/150 • 100% = 6.67%.

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