As (s) --> AsO43- (aq) (rxn 1)     3Ag+(aq) + AsO43- (aq) --> Ag3AsO4 (s) (rxn 2)   You find that 12.73 g of Ag3AsO4 precipitates from the solution in reaction 2. How many moles of arsenate ion (AsO43- ) must have reacted?  How many grams of As were in the original sample?

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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".