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9 October, 03:40

If 10.57 g of magnesium reacts completely with 6.96 g of oxygen, what is the percent by mass of oxygen in magnesium oxide? Round to the nearest tenth of a percent.

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  1. 9 October, 03:53
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    39.7 %

    Explanation:

    magnesium + oxygen ⟶ magnesium oxide

    10.57 g 6.96 g 17.53 g

    According to the Law of Conservation of Mass, the mass of the product must equal the total mass of the reactants.

    Mass of MgO = 10.57 + 6.96

    Mass of MgO = 17.53 g

    The formula for mass percent is

    % by mass = Mass of component/Total mass * 100 %

    In this case,

    % O = mass of O/mass of MgO * 100 %

    Mass of O = 6.96 g

    Mass of MgO = 17.53 g

    % O = 6.96/17.53 * 100

    % O = 0.3970 * 100

    % O = 39.7 %
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