According to the Law of Conservation of Mass, the total mass of the reactants must equal the total mass of the products.
In this case, we have:
- Mass of potassium (K) = 2 grams
- Mass of oxygen (O) = 5 grams
Total mass of reactants = 2 grams (K) + 5 grams (O) = 7 grams
Since potassium oxide (K₂O) will be the product formed from the reaction of potassium and oxygen, the total mass of potassium oxide produced will also equal the total mass of the reactants, which is 7 grams.
So, the correct answer is:
7 grams
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