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3 July, 06:03

What's is the percent composition by mass of oxygen in magnesium oxide, Mg0

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  1. 3 July, 06:10
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    40%

    Explanation:

    We'll begin by obtaining the molar mass of MgO. This is illustrated below:

    Molar Mass of MgO = 24 + 16 = 40g/mol

    Observing the formula MgO, we have 1 atom of O in it.

    The percentage composition by mass of oxygen in MgO is given by:

    Mass of O/Molar Mass of MgO x 100

    = 16/40 x 100 = 40%
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