Hydrogen  H2  gas   and oxygen  O2  gas react to form water  H2O  vapor. Suppose you have 5.0 mol of H2

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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".