Mg3N2 +3H2O -> 3MgO+2NH3   Weight of empty crucible and cover :   23.480 g Weight of crucible, cover, MgO and Mg3N2 :   24.208 g Weight of crucible, cover, MgOand addition of H2O and heat :   24.211 g   Calculate the change in mass. Calculate the number of moles of Mg3N2.   Calculate the number of grams of Mg3N2.   Calculate the weight % of Mg3N2.

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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".