A sample of mercury(I) nitride weighs 3.33 dg.  How many nitrogen atoms are in this sample?The answer must be 3.26 x 10^20 N . I need the solution how to get the answer

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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".