The reaction 3A + 2B → 2C + 6D is found to be third order overall and third order with respect to A. What is the most likely rate law?

Question

	rate = k[A]^3
	None of the above
	rate = k[A]^3[C]
	rate = k[A]^3[B]^2
	rate = k[B]^3

Answer 1

Since the reaction is 3rd order overall, and 3rd order with respect to [A], that means it must be 0 order with respect to [B]. Thus, the rate law would be ..

rate = k[A]³ (first choice)