Question

conservation quick check
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)
5 grams
7 grams
10 grams
2 grams

Explanation:

Step1: Recall law of conservation of mass

The law states that mass is conserved in a chemical reaction. Total mass of reactants = Total mass of products.

Step2: Calculate mass of products

Mass of potassium = 2 grams, mass of oxygen = 5 grams. Total mass of reactants = 2 + 5 = 7 grams. So mass of potassium oxide (product) is 7 grams.

Answer:

7 grams (corresponding to the selected option in the original multiple - choice question)