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31 May, 10:45

How many grams of magnesium oxide can be produced when 125 g Mg react with 102 g O2?

Unbalanced equation: Mg + O2 → MgO

Show, or explain, all of your work along with the final answer.

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  1. 31 May, 14:34
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    The balanced chemical reaction is

    2Mg + O2 → 2MgO

    To determine the amount of magnesium oxide produced from the reaction, we use the initial amount of the reactants and the relation of the substances from the reaction. We do as follows:

    125 g Mg (1 mol / 24.31 g) = 5.14 mol Mg

    102 g O2 (1 mol / 32 g) = 3.19 mol O2

    Therefore, the limiting reactant is magnesium. We calculate as follows:

    5.14 mol Mg (2 mol MgO / 2 mol Mg) (40.31 g / mol) = 207.19 g MgO produced.
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