10 g of sodium sulfate was dissolved in 90 g of water. Determine the mass fraction of sodium sulfate in the solution.

1) Find the mass of the solution after dissolving salt and water. To do this, add the mass of salt and the mass of water: 90 + 10 = 100g.
2) Find the mass fraction of salt in the solution. To do this, divide the mass of salt by the mass of the entire solution and multiply by one hundred percent: 10/100 * 100 = 10%.
Answer: the mass fraction of salt in the solution is ten percent.



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