Ozone (O3) decomposes into molecular oxygen according to the equation below. 2 O3 (g) --> 3 O2 (g) If you had a sample of ozone which decomposes into oxygen, which of the following statements is true? a. The mass of the oxygen at the end is greater than the mass of the starting ozone. b. The volume of the oxygen at the end is less than the volume of the starting ozone. c. The total number of molecules does not change during the reaction. d. The total number of atoms does not change during the reaction.

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Q: The total number of atoms does not change during the reaction.

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".