A sample of limestone and other soil materials is heated, and the lilmestone decomposes to give calcium oxide and carbon dioxide.
CaCO3 (s) = CaO(s) + CO2(g)
A 1.506-g sample of limestone-containing material gives .558 g of CO2 in addition ti CaO, after being heated at a high temperature. What is the mass percent of CaCO3 in the original sample?