Answer to Question #70683 in General Chemistry for Jon

Question

5. A 20.0 g sample of a mixture of CO2(g) and CO(g) is treated, according to the following reaction, with air at room temperature over a Pt/CeO2-ZrO2-Bi2O3 catalyst. The total mass of CO2(g) at the end of the reaction is 27.9 g.

Answer 1

CO(g) + ½O2(g) → CO2(g)
28g/mol 44g/mol
x 11x/7
20.0 g – x + 11x/7 = 27.9
x = 13.825
% (CO2) = (20.0 – 13.825)g/20.0g = 30.875%  30.9 %