Putting Na+ and AsO4 3- together and using the criss cross method gives Na3AsO4. This appears to have a -8 charge, which I am assuming means that isn't the correct combined formula as the instructions say it should be balanced. What am I missing?

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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".