The data below is for the reaction sequence A B C D Elementary step rH kJ mol1 Ea kJ mol1 A B 42 84 B C 21 63 C D 84 42 Hint Use the data to prepare a graph of the reaction profile and then answer the questions below Your graph should be properly labelled and drawn to scale (a) Which of the following steps has the smallest rate constant A B B C C D (b) Which of the following steps has the largest rate constant A B B C C D (c) Which of the following steps is the rate determining step A B B C C D (d) What is the enthalpy of reaction for the overall reaction rH kJ mol 1 (e) What is the activation energy for the overall reaction in the forward direction Ea (forward) kJ mol 1 (f) What is the activation energy for the overall reaction in the reverse direction Ea (reverse) kJ mol 1

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Question: The data below is for the reaction sequence A B C D. Elementary step rH/kJ mol1 Ea/kJ mol1 A B 42 84 B C -21

The data below is for the reaction sequence A B C D.

Elementary step	rH/kJ mol1	Ea/kJ mol1
A B	42	84
B C	-21	63
C D	-84	42

Hint: Use the data to prepare a graph of the reaction profile and then answer the questions below. Your graph should be properly labelled and drawn to scale.

(a) Which of the following steps has the smallest rate constant?

		A B
		B C
		C D

(b) Which of the following steps has the largest rate constant?

		A B
		B C
		C D

(c) Which of the following steps is the rate determining step?

		A B
		B C
		C D

(d) What is the enthalpy of reaction for the overall reaction?

rH= kJ mol¹

(e) What is the activation energy for the overall reaction in the forward direction?

Ea (forward)= kJ mol¹

(f) What is the activation energy for the overall reaction in the reverse direction?

Ea (reverse)= kJ mol¹

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