13) If you burn a piece of magnesium (Mg) ribbon, the ending mass of the
product is 15 grams. If you started with 12 grams of magnesium, how much
oxygen was added? Use the Law of conservation of mass and this equation:
2 mg + O₂ → 2MgO

The idea here is that chemical reactions must obey the Law of Mass Conservation, which states that when a chemical reaction takes place, the total mass of the reactants must be equal to the total mass of the products. In your case, magnesium metal and oxygen gas are the reactants and magnesium oxide is the product.

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13) If you burn a piece of magnesium (Mg) ribbon, the ending mass of the product is 15 grams. If you started with 12 grams of magnesium, how much oxygen was added? Use the Law of conservation of mass and this equation: 2 mg + O₂ → 2MgO

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13) If you burn a piece of magnesium (Mg) ribbon, the ending mass of the
product is 15 grams. If you started with 12 grams of magnesium, how much
oxygen was added? Use the Law of conservation of mass and this equation:
2 mg + O₂ → 2MgO