Chemical Kinetics Worksheet With Answers By Prof. Abdullah M. Asiri - 2009 Page 5
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33August 16, 2009
[PROBLEM SET FROM R. CHANG TEST
BANK]
(aq) → 2SO
2-
-
2-
-
16. The data below were determined for the reaction S
O
+ 3I
+ I
.
2
8
4
3
The rate law for this reaction must be:
2-
-
3
A.
rate = k[S
O
][I
]
.
2
8
2-
B.
rate = k[S
O
].
2
8
2-
2
-
2
C.
rate = k[S
O
]
[I
]
.
2
8
-
D.
rate = k[I
].
2-
-
E.
rate = k[S
O
][I
].
2
8
17. At 25°C the rate constant for the first-order decomposition of a pesticide solution is 6.40 × 10
-3
-1
min
. If
the starting concentration of pesticide is 0.0314 M, what concentration will remain after 62.0 min at
25°C?
1.14 × 10
-1
A.
M
B.
47.4 M
C.
-8.72.0 M
2.11 × 10
-2
D.
M
2.68 × 10
-2
E.
M
18. A certain first-order reaction A → B is 25% complete in 42 min at 25°C. What is the half-life of the
reaction?
A.
21 min
B.
42 min
C.
84 min
D.
120 min
E.
101 min
5
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