Calcium and magnesium carbonates occur together in the mineral dolomite. Suppose you heat a sample of the mineral to obtain the oxides, CaO and MgO, and then treat the oxide sample with hydrochloric acid. If 7.695 g of the oxide sample requires 125 mL of 2.55 M HCl, 

what is the weight percent of each oxide (CaO and MgO) in the sample?

Transcribed Image Text:

CaO(s) + 2 HCl(aq) → CaCl₂(aq) + H₂O(l) MgO(s) + 2 HCl(aq) → MgCl₂(aq) + H₂O(l)