Chemistry 102: Equilibrium: Find Equilibrium constant based off images/time.

Question

The progress with time of a reaction system is depicted in the figure here. Red spheres represent the molar concentration of substance A, and blue spheres represent the molar concentration of substance B.

What is the value of the equilibrium constant K_c?

   

Answer 1

The biggest problem here is counting the red and blue balls. There seems to be no change between the 3rd and 4th panel - so equilibrium has been reached. The total number doesn't change, so the stoichiometry is 1:1

R → B So the K = n_B/n_R = N_B/N_R where n is moles and N is number, since the volume is constant. I get 16/24 but please count them yourself.

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