(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

1. According to the mechanism below, what is the correct expression for the rate of consumption of A? In the mechanism, M is a molecule that collides with A and A* is a highly-energized form of A.

Step 1 (reversible): A + M <---> A* + M rate constants k1 and k-1

Step 2 (irreversible): A* ---> C rate constant k2

Select one of the following:

Rate = k1 [A] [M] / (k-1[M] + k2)

Rate = [A] / [C]

Rate = k1k2 [A] [M] / (k-1[M] + k2)

Rate = k1k2 [A]

Rate = k1[A]

Rate = (k1 [A] [M] + k-2[C] ) / (k-1[M] + k2)

Rate=k1k2 / (k-1+k-2)

Rate = (k1+k2-k-1-k-2) [A]

Rate = k1k2 [A] / (k-1+k2[M])

Rate=k1+k2-k-1-k-2

Rate = [C] / [A]

Rate = k1k2 [A] [M] / k-1

2. Relevant equations

3. The attempt at a solution

I tried to assume a steady-state approximation as I'm not sure which is the slow step. I found the overall rate of reaction and assumed it to be equivalent to the consumption of A.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Chemical Kinetics: Reaction Mechanism

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**