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2Mg + O2 -> 2MgO

1 mole of Oxygen yields two moles of MgO

moles of oxygen = 0.643 mol

moles of MgO formed = 1.286 mol

grams of MgO formed = 40.3 X 1.286 = 51.8258 g

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Q: How many grams of magnesium oxide are formed when 14.4 of oxygen gas measured at STP completely reacts with magnesium metal according to this reaction?
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