18-07-2018
Chemistry

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If 45.8 grams of MgO are dissolved in 205 grams of water, what is the concentration of the solution in percent by mass? 4.48% MgO 18.3% MgO 22.3% MgO 28.8% MgO

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ralphwx1 ralphwx1

18-07-2018

percent by mass = mass (MgO) / mass (solution)

mass of solution = 45.8 grams (MgO) + 205 grams (H2O) = 250. grams

mass (MgO) = 45.8 grams

percent by mass = 45.8 grams / 250. grams = 0.1832 = 18.32%

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