Consider the gas-phase equilibrium A ? B. In a series of experiments, different initial amounts of A and B are mixed together, and the mixture in each case allowed to come to equilibrium. Which one of these experiments would yield values for the amounts of A and B present at equilibrium different from all the other experiments?

a. 3.0 moles A, 4.5 moles B

b. 4.5 moles A, 3.0 moles B

c. 1.5 moles A, 4.5 moles B



d. 7.5 moles A, no B

e. 0.5 moles A, 7.0 moles B

(please give an explanation)