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OpenStudy (anonymous):

Twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete?

OpenStudy (jfraser):

if nothing is left over, all the atoms that you started with must still be present when the reaction is complete, so how much SHOULD the magnesium oxide weigh?

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