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.

Chemistry - DrBob222, Monday, October 1, 2012 at 12:19am
The CO2 pressure drops from 740 torr to 390 torr; the difference is the pressure of CO2 that reacted and that converted to atm ((740-390)/760 = ?atm
Use PV = nRT to solve for mols CO2.
MgO + CO2 ==> MgCO3.
mols CO2 = mols MgO and that x molar mass = grams MgO.
%MgO = (grams MgO/mass sample)*100 = ?

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