A 4.00-g sample of a mixture of CaO and BaO is placed in a
1.00-L vessel containing CO2 gas at a pressure of 97.33 kPa
and a temperature of 25 °C. The CO2 reacts with the CaO
and BaO, forming CaCO3 and BaCO3. When the reaction
is complete, the pressure of the remaining CO2 is 20.0 kPa.
(b) Calculate the mass percentage of CaO in the mixture.
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