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13 April, 10:43

You are producing magnesium oxide by the reaction 2 Mg + O 2 > 2 MgO. If you start out with 6 moles of magnesium, how many moles of oxygen will you need? How many moles of magnesium oxide will you produce?

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  1. 13 April, 10:57
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    2 Mg + O₂ - -> 2 MgO

    If we have 6 moles of magnesium, then we use the ratios from the balanced equation to find the moles of oxygen needed

    MOLES O₂ = MOLES MG * (1 O₂ / 2 Mg) <-- - we get this from equation

    = 6 mol Mg * (1 O₂ / 2 Mg)

    = 3 mol O₂

    We need 3 moles of oxygen otherwise we will not have all 6 moles of magnesium react. This will product

    MOLES MgO = MOLES MG * (2 MgO / 2 Mg)

    = 6 mol Mg * (2 MgO / 2 Mg)

    = 6 mol MgO

    We will produce 6 moles of magnesium oxide
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