given that 4 NH3 + 5O2 -> 4NO + 6H2O if 3.00 mol NH3 were made to react with excess of oxygen gas, the amount of H2O formed would be?

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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".