How many grams of N2 are needed to make 444 g of NBr3 ?  N2   +   3 Br2   →   2 NBr3   +   44.0 kJ              The molar mass of NBr3 is 253.719 g and the molar mass of N2 is 28.013 g

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A: Mole = Mass of substance/Molar mass.

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Q: any moles

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Q: heat

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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".