Think about the following reaction: 2 A (g)⟶B (g) +2 C (g)   Assume that we start with 100.0 moles of A and zero moles of B and zero moles of C.   This is pure stoichiometry.   If my final number  of moles is 107, how many moles of A do I have?

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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".