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Magnesium combines with oxygen to form magnesium oxide. If 20.07 g of magnesium reacts completely with 6.70 g of oxygen, what is the percent by mass of oxygen in magnesium oxide?

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Mg = 20.07
MgO = 20.07+6.70 = total
%Mg = (20.07/total)*100 = ?

75 or 74.9

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