Weight percentage [Chemistry HELP]?

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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,

CaO + 2 HCl >> CaCl2 + H2O
MgO + 2 HCl >> MgCl2 + H2O

What in the weight percentage of each oxide (CaO and MgO) in the sample?
 
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