[marygulli]

Hi!

Can somebody please help me?

At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction

   2CO2(g)  -> <- 2CO(g)  +  O2(g)

is about 1 E-13. Assuming that the exhaust gas (total pressure 1 bar) contains 0.2% CO,  12% CO2 and 3% O2 by volume, is the system at equilibrium with respect to the reaction? Based on your conclusion, would the CO concentration in the exhaust be decreased or increased by a catalyst that speeds up the reaction above?

Thanks a million! :-)

[tamim83]

What is the expression for the Kp of this reaction?

After you get that, treat the percentages as mole fractions.  The partial pressure of each component should then be its mole fraction times the total pressure (which in this case is 1 bar, making it easier).