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April 19, 2014

Homework Help: Chemistry

Posted by Helga on Sunday, September 30, 2012 at 9:12pm.

The oxides of Group 2A metals (symbolized by M here) react with carbon dioxide according to the following reaction:
MO(s) + CO2(g)  MCO3(s)
A 2.85-g sample containing only MgO and CuO is placed in a 3.00-L container. The container is filled with CO2 to a pressure of 740. torr at 20.C. After the reaction has gone to completion, the pressure inside the flask is 390. torr at 20.C. What is the mass percent of MgO in the mixture? Assume that only the MgO reacts with CO2.

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