A sample of calcium metal is contaminated by a certain amount of highly toxic, radioactive thorium metal (Th). A 10.00-gram sample of this mixture is dissolved in the acid, and reacted with excess sodium oxalate to produce a precipitate which is a mixture of the thorium oxalate, Th(C2O4)2 and the calcium oxalate, CaC2O4. The total mass of this precipitate is 31.03 grams. Calculate the mass of each metal in the original 10.00-gram mixture.