Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.

Answer 1

Kc = (CO)^2(O2)/(CO2)^2
Convert grams given to moles. moles = grams/molar mass. Convert to molarity from moles/5.0, then substitute into the Kc expression above and calculate Kc.