6. The amount of calcium present in milk can be determined by adding oxalate to a sample and measuring the mass of calcium oxalate precipitated. What is the mass percent of calcium if g of calcium oxalate forms in a 125-g sample of milk when excess aqueous sodium 0.429 oxalate is added? Na,C2O4(aq) + Ca²*(aq) → CaC2O4(s) + 2Na*(aq) a. 0.107% b. 0.202% 0.343% с. d. 1.10% е. 1.37%

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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".