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9 May, 23:42

Stoichiometry: How much magnesium oxide, in grams, is produced from the reaction of 2 grams of magnesium?

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  1. 10 May, 02:36
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    1) Chemical equation:

    Mg + O2 - > MgO

    2) Balanced chemical equation:

    2Mg + O2 - > 2MgO

    3) Ratios

    2 mol Mg : 1 mol O2 : 2 mol MgO

    4) Convert 2 grams of Mg to number of moles

    Molar mass of Mg: 24.3 g/mol

    # of moles = grams / molar mass = 2g / 24.3 g/mol = 0.0823 mol

    5) Use the theoretical ratio fo find the number of moles of MgO produced

    0.0823 mol Mg * 2mol MgO / 2 mol Mg = 0.0823 mol MgO

    6) Use the molar mass of MgO to obtain the quantity in grams

    Molar mass of MgO = 24.3 g/mol + 16 g/mol = 40.3 g/mol

    0.0823 mol MgO * 40.3 g / mol = 3.32 g

    Answer: 3.32 g
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