Question

2 grams of potassium (K) reacts with 5 grams of oxygen (O). According to the Law of Conservation of mass, how many grams of potassium oxide (K2O) will produced?

5 grams
2 grams
10 grams
7 grams

Answer 1

To determine how many grams of potassium oxide (K₂O) will be produced from the reaction of potassium (K) and oxygen (O) according to the Law of Conservation of Mass, we first need to account for the mass of the reactants.

1. **Calculate the total mass of the reactants**:
- Mass of potassium = 2 g
- Mass of oxygen = 5 g
- Total mass of reactants = 2 g + 5 g = 7 g

2. **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 potassium oxide (K₂O) produced will also be 7 g.

Thus, the answer is **7 grams**.