To 150 g of a 5% salt solution, add 100 g of water, calculate the mass fraction of salt in the resulting solution.

After adding water to the solution, its mass will become equal to 150 + 100 = 250 grams.

The mass of salt in the initial solution is 150 x 0.05 = 7.5 grams.

In the new solution, the mass of salt will not change.

The mass fraction in the resulting solution will be 7.5 / 250 = 0.03 = 3.0%;

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