Question

read the passage and answer the following question(s). water formation water (h₂o) is a compound required for survival by living organisms. the diagram below shows the chemical reaction of hydrogen gas (h₂) with oxygen gas (o₂) to form water (h₂o). chemical reaction forming water 2h₂ + o₂ → 2h₂o choose the statement that best compares the mass of the products to the mass of the reactants. a. the number of hydrogen atoms and oxygen atoms changes during the reaction, so the mass changes during the reaction. b. the number of hydrogen atoms and oxygen atoms changes during the reaction, but the mass does not change during the reaction. c. the number of hydrogen atoms and oxygen atoms is the same before and after the reaction, but the mass changes during the reaction. d. the number of hydrogen atoms and oxygen atoms is the same before and after the reaction, so the mass does not change during the reaction.

Explanation:

Step1: Analyze the chemical equation

The balanced equation $2H_2 + O_2
ightarrow2H_2O$ shows that there are 4 hydrogen atoms and 2 oxygen atoms on both the reactant and product sides.

Step2: Recall the law of conservation of mass

In a chemical reaction, the total mass of the reactants equals the total mass of the products because the number of each type of atom is conserved.

Answer:

D. The number of hydrogen atoms and oxygen atoms is the same before and after the reaction, so the mass does not change during the reaction.