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 be produced? (1 point)

Responses

10 grams
10 grams

7 grams
7 grams

2 grams
2 grams

5 grams

1 answer

To determine how many grams of potassium oxide (K₂O) will be produced, you can start by using the Law of Conservation of Mass, which states that mass is neither created nor destroyed in a chemical reaction.

  1. First, we need to calculate the total mass of reactants:

    • Mass of potassium (K) = 2 grams
    • Mass of oxygen (O) = 5 grams
    • Total mass of reactants = 2 grams + 5 grams = 7 grams
  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 grams.

Given the choices, the correct response is 7 grams.