Chemical Kinetics Worksheet With Answers By Prof. Abdullah M. Asiri - 2009 Page 7
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33August 16, 2009
[PROBLEM SET FROM R. CHANG TEST
BANK]
22. A certain first-order reaction A → B is 25% complete in 42 min at 25°C. What is its rate constant?
6.8 × 10
-3
-1
A.
min
8.3 × 10
-3
-1
B.
min
3.3 × 10
-2
-1
C.
min
-3.3 × 10
-2
-1
D.
min
-1
E.
11 min
+
-
23. Ammonium ion (NH
) reacts with nitrite ion (NO
) to yield nitrogen gas and liquid water. The following
4
2
initial rates of reaction have been measured for the given reactant concentrations.
Which of the following is the rate law (rate equation) for this reaction?
+
-
4
A.
rate = k [NH
][NO
]
4
2
+
-
B.
rate = k [NH
][NO
]
4
2
+
-
2
C.
rate = k [NH
][NO
]
4
2
+
2
-
D.
rate = k [NH
]
[NO
]
4
2
+
1/2
-
1/4
E.
rate = k [NH
]
[NO
]
4
2
24. Appropriate units for a second-order rate constant are
A.
M/s.
B.
1/M·s.
C.
1/s.
2
D.
1/M
·s.
25. The isomerization of cyclopropane to form propene
is a first-order reaction. At 760 K, 15% of a sample of cyclopropane changes to propene in 6.8 min. What
is the half-life of cyclopropane at 760 K?
3.4 × 10
-2
A.
min
B.
2.5 min
C.
23 min
D.
29 min
E.
230 min
7
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