Question

#1 A mixture of calcium sulfate (CaSO₄) andcalcium uranate (CaUO₄) contains 10% sulfur bymass.

What i the mass percentage of uranium in themixture?

#2 A mixture containing 50 g of carbon (C) and 50 g of lime(CaO) is reacted at high temperature to produce calcium carbide(CaC₂) according to the reaction

CaO_(s) + 3 C_(s) ?CaC_2(s) + CO_(g)

Assuming that the reaction goes to completion and that oneof the reactants is completely consumed, what is the weight percentof unreacted reagent in the solid residue produced?

A)90.7 B)46.6 C)15.6 D)85.4 E)23.8