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Solutions/Answers to NCERT/CBSE CHEMISTRY Class 12(Class XII)textbook
CHAPTER FOUR
CHEMICAL KINETICS
EXERCISES
4.15
The experimental data for decomposition of N2O5
[2N2O5 . 4NO2 + O2]
in gas phase at 318K are given below:
t/s 0 400 800 1200 1600 2000 2400 2800 3200
102 × [N2O5]/
mol L–1
1.63 1.36 1.14 0.93 0.78 0.64 0.53 0.43 0.35
(i) Plot [N2O5] against t.
(ii) Find the half-life period for the reaction.
(iii) Draw a graph between log[N2O5] and t.
(iv) What is the rate law ?
(v) Calculate the rate constant.
(vi) Calculate the half-life period from k and compare it with (ii).
Log [N2O5}
2
t(sec)
10 [N2O5] mol/ L
-1.79
0
1.63
-1.87
400
1.36
-1.94
800
1.14
-2.03
1200
0.93
-2.11
1600
0.78
-2.19
2000
0.64
-2.28
2400
0.53
-2.37
2600
0.43
-2.46
3200
0.35
(1)
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1.6
1.4
1.2
1
t(sec)
0.8
102 [N2O5] mol/ L
0.6
0.4
0.2
12
00
16
00
20
00
24
00
26
00
32
00
80
0
40
0
0
0
(iii)
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-1.8
-1.9
Log[N2O5]
-2
-2.1
Log [N2O5}
-2.2
t(sec)
-2.3
-2.4
-2.5
0
400 800 1200 1600 2000 2400 2600 3200
time
(iv) &(v)
(vi)
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