Chlorine gas reacts with carbon monoxide to produce phosgene according to the fo
ID: 794296 • Letter: C
Question
Chlorine gas reacts with carbon monoxide to produce phosgene according to the following
chemical reaction:
Cl2 (g) + CO (g) ? Cl2CO (g)
It is experimentally observed that when the concentration of CO is decreased 10?fold, the rate of
the reaction also decreases by a factor of 10, while when the concentration of Cl2 is increased
10?fold, the rate of the reaction increases by approximately a factor of 30.
a) Write down the rate law for this reaction in terms of a rate constant, k, and the
concentrations of Cl2 and CO.
b) What is the overall order of the reaction, and the orders with respect to Cl2 and CO?
c) What are the units of k for the reaction?
d) If the rate of the reaction at time t is equal to v, and the concentrations of Cl2 and CO are
instantaneously increased by a factor of 2 and 3, respectively, what is the reaction rate in
units of v.
Explanation / Answer
a)
R = K [CO]^m [Cl2]^n
AS CO decreases by 10 R dec by 10 so m=1
and calculating n .............30R = K [CO]^m [10Cl2]^n
30 = 10^n
ln(30) = n ln(10)
n = ln30/ln10 = 1.477
n=1.477
R = K [CO] [Cl2]^1.477
b) order of reaction = 1.477 + 1 = 2.477
c)
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