favorites . ( we do this in organic chemistry a lot.) In the gas phase, nitroge
ID: 1011164 • Letter: F
Question
favorites . ( we do this in organic chemistry a lot.) In the gas phase, nitroge with chlorine gas to form nitrosyl chloride, NOCI. n monoxide reacts 2 NO(g) Cl2(g) + 2 NOCl(g) The observed rate law for this reaction is rate K(NOICI. For each of the five proposed mechanisms below, determine the rate law and state if it is consistent with the observed rate one mechanism is consistent with the data, which is most likely and why? Mechanism #1: 2 NO + Cl2 2 NOCl law. If more than slow Mechanism #2: NO + Cl2 NOCl + Cl CI + NO NOCl slow fast NO +Cl2 Cl + NO NOCl Mechanism #3: NOCl+ Cl fast slow NO + Cl2 NOCl; NOC12 + NO 2 NOCl slow fast Mechanism#4 fast slow NOC NOCl NO + C12 NOCI2 + NO 2 NOCI Mechanism #5:Explanation / Answer
rate depends on the slowest step
Mechanism 1:
rate law is:
rate = k [NO]^2 [Cl2]
Mechanism 2:
rate law is:
rate = k [NO] [Cl2]
Mechanism 3:
rate law is:
rate = k' [NO] [Cl]
but Cl is intermediate.
So use 1st equation
Kc = [NOCl][Cl] / [NO][Cl2]
[Cl] = Kc [NO][Cl2] / [NOCl]
put this in rate expression
rate = k' [NO] [Cl]
= k' [NO] Kc [NO][Cl2] / [NOCl]
= k [NO]^2 [Cl2] /[NOCl]
Mechanism 4:
rate law is:
rate = k [NO] [Cl2]
Mechanism 5:
rate law is:
rate = k' [NO] [NOCl2]
but Cl is intermediate.
So use 1st equation
Kc = [NOCl2] / [NO][Cl2]
[NOCl2] = Kc [NO][Cl2]
put this in rate expression
rate = k' [NO] [Cl]
= k' [NO] Kc [NO][Cl2]
= k [NO]^2 [Cl2]
So mechanism 1 and mechanism 5 are possible
Mechanism 5 is most likely as this is complex reaction and its mechnism must involve more than 1 steps
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