In what mass of water should 200 g of a thing be dissolved in order to obtain a mass fraction of 15%.

1. Let’s find the mass of a 15% solution by the formula:

m (solution) = m (solute) * 100% / w (solution) = 200 * 100/15 = 1333 g

2. We calculate the mass of water in solution by the formula:

m (water) = m (solution) – m (solute) = 1333 – 200 = 1133 g.

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