Nitrogen
Oxygen
Water Vapor
Carbon Dioxide
Methane
Nitrous Oxide
Ozone
Everything else - 3-billion-way tie :)
A mixture means two or more substances forming into one new substance, look at your answers that you have. Does it show two or more different substances that chemically change into one new substance?
Kc = [b]*[c]/([a]^2) = (0.2 M)^2/(0.2 M)^2 = 1.0
To achieve equilibrium, Kc must be equal to 0.2, therefore Kc must decrease, so the concentrations of b and c must decrease and the concentration of a must increase, meaning the reaction will proceed toward the formation of a.
