CHPR3432 Tute 1 Questions
2
The University of Western Australia Chemical and Process Engineering CHPR 3432 Chemical Kinetics and Reactor Designs Tutorial 1 1. Classify the following reactions into elementary and non-elementary reaction (Note these reactions in reality may follow the rate laws given): a) [ ] 5 2 2 2 5 2 4 2 O N k rate O NO O N = + → b) [ ][ ] 2 2 2 ) ( 2 ) ( ) ( 2 Cl NO k rate g NOCl g Cl g NO = → + c) k rate g H g N g NH Pt C o = + → ) ( 3 ) ( ) ( 2 2 2 , 856 3 d) [ ] [ ] - - - = + → + OH COOCH CH k rate OH CH COO CH OH COOCH CH 3 3 3 3 3 3 e) [ ][ ] 2 2 2 25 2 ) ( 2 ) ( ) ( 2 NO O k rate g NO g O g NO C o = → + f) [] Δ = = → Δ k rate CH CH CH 2 3
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Transcript of CHPR3432 Tute 1 Questions
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The University of Western Australia Chemical and Process Engineering CHPR 3432 Chemical Kinetics and
Reactor Designs Tutorial 1
1. Classify the following reactions into elementary and non-elementary reaction (Note these reactions in reality may follow the rate laws given): a)
[ ]522252 42
ONkrateONOON
=
+
b)
[ ] [ ]222 )(2)()(2
ClNOkrategNOClgClgNO
=
+
c)
krategHgNgNH PtC
o
=
+ )(3)()(2 22,8563
d)
[ ][ ]
=
++
OHCOOCHCHkrateOHCHCOOCHOHCOOCHCH
33
3333
e)
[ ][ ]222
252 )(2)()(2NOOkrate
gNOgOgNO Co
=
+
f)
[ ]==
krate
CHCHCH 23
-
g) )(3)(3)(6)(5)( 223 lOHaqBraqHaqBraqBrO +++ +
What is the reaction order with respect to each reactant component and the overall order for each reaction.
2. What is the unit of the rate constant for a) a zero order, b) a first order and c) a second order.
3. Explain briefly the dependence of rate constant upon activation energy E ( use Arrhenius Law) ?
4. The rate of the second-order decomposition of acetaldehyde ( )CHOCH 3 was measured over the temperature range 700-1000K, and the rate constants are reported below. Find the activation energy E and the pre-exponential factor
ok .
KT / 700 730 760 790 810 840 910 1000 )../( 11 smolLk 0.011 0.035 0.105 0.343 0.789 2.17 20.0 145.0
(ans: ).184,..103.5 11111 == molkJEsmolLxko
5. The irreversible reaction
BABA 22 + has been studied kinetically, and the rate of formation of product has been found to be well correlated by the following rate equation:
[ ] [ ][ ]A
BAr BA 21
72.0 22 +
=
What reaction mechanism is suggested by this rate expression if the chemistry of the reaction suggests that the intermediate consists of an association of reactant molecules and that a chain reaction does not occur?
[ ][ ][ ]23 += HBrBrOkrate
