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Ch8_66. Magnezium oxide can be produced by heating magnesium metal in the presence of oxygen. The balanced equation for the reaction is: 2 Mg(s) + O2(g) ----> 2MgO (s). When 10.1 g of Mg react with 10.5 g of O2, 11.9g of MgO are collected. Determine the limiting reactant, theoretical yield, and percent yield for the reaction.