Which of the following reactions yield appreciable equilib- rium concentrations of both reactants and products? (a) 2 Cu1s2 + O21g2 ∆ 2 CuO1s2; Kc = 4 * 1045

Video transcript

Hello everyone today. We have the following problem identify which gives a comparable concentration of products and reaction reactant at equilibrium. So before we do that we want to recall that K. C. Or the equilibrium constant can be used to determine the extent of a reaction. And give us an idea of the relative amounts of our reactant or the concentration of our reactant and the concentration of our products. And so if we look at option A here and we see this reaction with the following equilibrium constant. We note that the equilibrium constant is very small. It's some number two. The -48. That is a very small number. And so since it is very small The reverse reaction is going to be favored. So it's going to be favored in this direction which is going to be forming more gaseous water or H20. And so the equally mixture, the equilibrium mixture is going to contain mostly the reactor which is water. And so Andrew is actually not going to be our answer. If we look at answer choice B. Answer choice B is the exact opposite of answer choice A. The equilibrium constant is very large. Write this number to the 10 times or 10 to the 31st power is a very very large number. And so that means that the equilibrium is going to favor the forward direction. So it's going to form or favor the hydrochloric acid production. So it's going to be mostly on the products with mostly favoring products. So that cannot be representative of equilibrium. However, if we look at answer choice C, we have a moderate equilibrium constant, and so this is going to be the closest or the best representation of equilibrium. And so with that we've answered the question as answer choice C. Overall, I hope this helped, and until next time.