Examine the following reactions.Reaction 1PCl3(g) + Cl2(g) →→ PCl5(g) Reaction 2PCl5(g) →→ PCl3(g) + Cl2(g)Which options correctly explain the relationship between the two reactions? Select all that apply. Both reactions contain entirely gaseous substances, making them both decomposition reactions. Both reactions contain all the same substances, making them both synthesis reactions. Reaction 1 is the opposite of Reaction 2. The reactant in Reaction 2 breaks apart, making it a decomposition reaction. The reactants in Reaction 1 combine instead of breaking apart, making it a synthesis reaction. Reaction 1 is the same as Reaction 2.

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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".