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 be produced? (1 point)
7 grams
10 grams
2 grams
5 grams

Explanation:

Step1: Recall the Law of Conservation of Mass

The law states that in a chemical reaction, the total mass of reactants equals the total mass of products.

Step2: Calculate the total mass of reactants

The mass of potassium is 2 grams and the mass of oxygen is 5 grams. So the total mass of reactants is $2 + 5=7$ grams.

Answer:

7 grams