2 NO(g) + Cl 2 (g) --> 2 NOCl (g) Two proposed mechanisms for the reaction are g

Q: 2 NO(g) + Cl 2 (g) --> 2 NOCl (g) Two proposed mechanisms for the reaction are g

Mechanism 1 NO + Cl2 --> NOCl + Cl SLow step slow step is rate determining step NO + Cl --> NOCl fast step -------------------------------------------------------------------------------- 2 NO(g) + Cl2(g) --> 2 NOCl (g) over all reaction NO + Cl2 --> NOCl + Cl SLow step slow step is rate determining step of rate limiting step b. any intermediates . Cl is intermediate c. no catalyst

ID: 1070736 • Letter: 2

Question

2 NO(g) + Cl2(g) --> 2 NOCl (g)

Two proposed mechanisms for the reaction are given below. Which is the better mechanism? Explain both why the better mechanism is better and why the worse mechanism is worse.

Mechanism 1 Mechanism 2

NO + Cl2 --> NOCl + Cl Cl2 --> Cl + Cl

NO + Cl --> NOCl NO + Cl --> NOCl

NO + Cl2 --> NOCl + Cl

For the correct mechanism, identify:

a. the rate-limiting step

b. any intermediates

c. any catalysts

Explanation / Answer

Mechanism 1

NO + Cl2 --> NOCl + Cl SLow step slow step is rate determining step

NO + Cl --> NOCl fast step

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2 NO(g) + Cl2(g) --> 2 NOCl (g) over all reaction

NO + Cl2 --> NOCl + Cl SLow step slow step is rate determining step of rate limiting step

b. any intermediates . Cl is intermediate

c. no catalyst

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2 NO(g) + Cl 2 (g) --> 2 NOCl (g) Two proposed mechanisms for the reaction are g

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Explanation / Answer

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