20 g of salt, dissolved 230 g of water to determine the mass fraction of the solution.

To determine the mass fraction of a solution, you must use the formula:

w = m (solute) / m (total mass of solution) * 100%

The total mass of the solution is equal to the sum of the mass of water and solute:

m (total mass of solution) = 20 + 230 = 250 g

w = 20/250 * 100 = 8%

Answer: the mass fraction of the solution is 8%.

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