1) Consider the following reaction: 2NO 2 Cl(g) ? 2NO 2 (g) +Cl 2 (g) The follow
ID: 807086 • Letter: 1
Question
1)
Consider the following reaction:
2NO2Cl(g) ? 2NO2(g) +Cl2(g)
The following mechanism has been proposed:
What is Cl(g) in this reaction mechanism?
transition state complex
activated complex
intermediate
d) catalyst
2)
The reaction
H2(g) + I2(g) ? 2HI(g)
may occur by the following reaction mechanism:
Predict the rate law from this reaction mechanism. Hint: the first step is fast.
rate = k [I2]
rate = k [I]2
rate = k [I]2[H2]
rate = k [I2][H2]
a)transition state complex
b)activated complex
c)intermediate
d) catalyst
2)
The reaction
H2(g) + I2(g) ? 2HI(g)
may occur by the following reaction mechanism:
I2 2I (fast, equilibrium)
I + I + H2 2HI (slow)
Predict the rate law from this reaction mechanism. Hint: the first step is fast.
a)rate = k [I2]
b)rate = k [I]2
c)rate = k [I]2[H2]
d)rate = k [I2][H2]
Explanation / Answer
1. For the given two step reaction,
the overall reaction is 2NO2Cl(g) --------------> 2NO2(g) + Cl2(g)
In the overall reaction, Cl(g) is not seen where as it is seen in each step.
Hence, Cl(g) is an intermediate.
Option c is correct.
-----------------
2.
The rate law is given by the slowest step of the reaction sequence.
Hence, it is given by the equation,
I + I + H2 ----------> 2HI
Rate law = k [i]^2[H2]
thus, option c is correct.
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