According to the balanced reaction below calculate the moles of NH3 that form when 4.2 mol of N2H4 cpmpletely react. 3N2H4(l)-->4NH3(g)+N2(g) Im not sure where to even start with how to solve this,pleasehelp.

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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".