50 g of water was evaporated from 300 grams of salt solution with a mass fraction of salt of 20%. Determine the mass fraction of salt in the resulting solution
m (salt) = 300 * 0.2 = 60g, which means that before evaporation there was 300-60 = 240g of water. After evaporation, 240-50 = 190 g of water remained. The mass fraction of salt is equal to w (salt) = 60 / (190 + 60) = 0.24 (24%). Answer: 24%.
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