A reaction takes place in three steps- The rate constant of the three steps are k 1- k 2 and k 3 respectively- The overall rate constant k - k 1 k 3- k 2- The energy of activation for the three steps are 40-30 and 20 kJ respectively- Therefore-A- Overall energy of activation is 10 kJ-B- Overall energy of activation is 30 kJ-C- The reaction mechanism is 2 A k 1- k 2 A - A - A - rds k 3- Product and overall order is one-D- The reaction mechanism is A k 1- B - B k 2- C - C k 3- Product and overall order is one-

The correct options are B Overall energy of activation is 30 kJ. C The reaction mechanism is 2A k_1/k_2A^∗+A; A^∗ Product and overall order is one. Since, over ...

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Byju's Answer

Standard X

Chemistry

Factors Affecting the Rate of a Chemical Reaction

A reaction ta...

Question

A reaction takes place in three steps. The rate constant of the three steps are $k_{1}, k_{2}$ and $k_{3}$ respectively. The overall rate constant $k = \frac{k_{1} k_{3}}{k_{2}} .$ The energy of activation for the three steps are 40, 30 and 20 kJ respectively. Therefore:

Overall energy of activation is 10 kJ.

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Overall energy of activation is 30 kJ.

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The reaction mechanism is $2 A \frac{k_{1}}{k_{2}} A^{*} + A; A^{*} k_{3} - - \to r d s$ Product and overall order is one.

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The reaction mechanism is $A k_{1} - \to B; B k_{2} - \to C; C k_{3} - \to$ Product and overall order is one.

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Solution

The correct options are
B
Overall energy of activation is 30 kJ.

C
The reaction mechanism is $2 A \frac{k_{1}}{k_{2}} A^{} + A; A^{} k_{3} - - \to r d s$ Product and overall order is one.

Since, overall rate constant $k = \frac{k_{1} k_{3}}{k_{2}}$
So, total energy of activation is
$E a_{1} + E a_{3} - E a_{2} \Rightarrow 40 + 20 - 30 = 30 k J$
$2 A^{} k_{1} - \to k_{2} A^{} + A; A^{*} k_{3} - -- \to R D S$ Product
This satisfied the condition $k = \frac{k_{1} k_{3}}{k_{2}}$ and overall order is one.

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A reaction takes place in three steps. The rate constant of the three steps are k1,k2 and k3 respectively. The overall rate constant k=k1k3k2. The energy of activation for the three steps are 40, 30 and 20 kJ respectively. Therefore:

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