12. What is the order of a chemical reaction: A + 2 B → C, if the rate formation of C increases by a factor of 2.82 on doubling the concentration of A and increases by a factor of 9 on tripling the concentration B?
(A) 712,
(B) 7/4,
(C) 5/2,
(D) 5/4,
(E) 2.

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統計： A(2), B(1), C(1), D(0), E(0) #2789562