Calcium in river water samples can be precipitated out as Ca10(PO4)6(OH)2 (1,004.6 g/mol). The nearby laboratory water system may contain 2-10 mg/L calcium (40.078 g/mol) from the environment. How much sample (in L) should be taken to get a resulting precipitate of 0.0440g? How much is the highest possible mass of precipitate (in mg) if the amount above is obtained for analysis?

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Q: mass of precipitate

A:

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".