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The formula for this equation is:

2Mg + O2 ---> 2MgO

Originally, the weight you have is just the magnesium only. Although the oxygen is part of the reactants, you are not measuring it. Although, through the chemical reaction, the oxygen becomes bonded to the magnesium. Then you weigh the magnesium withthe added oxygen. So the final weight should be more than the original.

2 Mg (s) + O2 (g) → 2 MgO (s)

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