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27 November, 23:54

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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  1. 28 November, 03:31
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    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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