when 3 mol A and 4 mol b placed in the container and allowed to come to equilibrium, the resulting mixture is found to contain 0.80 mol. what is the value of K at equilibrium?

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium