To determine how many grams of potassium oxide (K2O) will be produced from the reaction of potassium (K) and oxygen (O), we first need to consider the Law of Conservation of Mass, which states that mass cannot be created or destroyed in a chemical reaction.
The balanced chemical equation for the reaction of potassium with oxygen to form potassium oxide is:
\[ 4 K + O_2 \rightarrow 2 K_2O \]
Now, we need to calculate the total mass of the reactants:
- Mass of potassium (K): 2 grams
- Mass of oxygen (O): 5 grams
Total mass of reactants = 2 grams (K) + 5 grams (O) = 7 grams.
According to the Law of Conservation of Mass, the total mass of the products must equal the total mass of the reactants. Therefore, the mass of the potassium oxide (K2O) produced will also be 7 grams.
Thus, the correct answer is:
7 grams
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