Chemical Kinetics Worksheet With Answers By Prof. Abdullah M. Asiri - 2009 Page 23
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33August 16, 2009
[PROBLEM SET FROM R. CHANG TEST
BANK]
78. For the reaction represented below, the experimental rate law is given by rate = k [(CH
)
CCl].
3
3
→ (CH
-
-
(CH
)
CCl(aq) + OH
)
COH(aq) + Cl
3
3
3
3
If some solid sodium hydroxide were added to a solution in which [(CH
)
CCl] = 0.01 M and [NaOH] =
3
3
0.10 M, which of the following would be true? (Assume the temperature and volume remain constant.)
A.
Both the reaction rate and k would increase.
B.
Both the reaction rate and k would decrease.
C.
Both the reaction rate and k would remain the same.
D.
The reaction rate would increase but k would remain the same.
E.
The reaction rate would decrease but k would remain the same.
→ 2N
79. At a particular temperature the first-order gas-phase reaction 2N
O
O
+ O
has a half-life for the
2
5
2
4
2
disappearance of dinitrogen pentoxide of 3240 s. If 1.00 atm of N
O
is introducted into an evacuated 5.00
2
5
L flask, what will be the total pressure of the gases in the flask after 1.50 hours?
A.
0.685 atm
B.
1.00 atm
C.
0.315 atm
D.
1.68 atm
E.
1.34 atm
→ 2NO
80. At a particular temperature the first-order gas-phase reaction N
O
+ (1/2)O
has a half-life for
2
5
2
2
the disappearance of dinitrogen pentoxide of 5130 s. Suppose 0.450 atm of N
O
is introducted into an
2
5
evacuated 2.00 L flask. What will be the total gas pressure inside the flask after 3.00 hours?
A.
0.969 atm
B.
0.105 atm
C.
0.795 atm
D.
1.14 atm
E.
0.864 atm
81. When acetaldehyde at a pressure of 364 mmHg is introduced into an evacuated 500. mL flask at 518°C,
CHO → CH
the half-life for the second-order decomposition process, CH
+ CO, is 410. s. What will the
3
4
total pressure in the flask be after 1.00 hour?
A.
327 mmHg
B.
654 mmHg
C.
37 mmHg
D.
691 mmHg
E.
728 mmHg
23
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