Nitrogen gas can be prepared by passing gaseous ammonia over solid copper (II) oxide at high temperatures. The other products of the reaction are solid copper and water vapor. A sample containing 17.5 g of ammonia (NH3) is reacted with 98.5 g of CuO. How many molecules of nitrogen gas will be formed? How many grams of water will be formed? How many grams of the excess reactant will remain after 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".