CHEM 104 MODULE 1 – MODULE 6 Exam Newest
Questions and Answers
Show your work and be sure to give answer with the correct units.
In the reaction of 0.200 M gaseous N2O5 to yield NO2 gas and O2 gas as shown
below:
2 N2O5 (g) → 4 NO2 (g) + O2 (g)
the following data table is obtained:
Time (sec)
[N2O5]
[O2]
0
0.200 M
0
300
0.180 M
0.010 M
600
0.162 M
0.019 M
900
0.146 M
0.027 M
1200
0.132 M
0.034 M
1800
0.110 M
0.045 M
2400
0.096 M
0.052 M
3000
0.092 M
0.054 M
(a) Use the [O2] data from the table to calculate the average rate over the measured
time interval from 0 to 3000 secs.
(b) Use the [O2] data from the table to calculate the instantaneous rate early in the
reaction (0 secs to 300 sec).
(c) Use the [O2] data from the table to calculate the instantaneous rate late in the
reaction (2400 secs to 3000 secs).
Questions and Answers
Show your work and be sure to give answer with the correct units.
In the reaction of 0.200 M gaseous N2O5 to yield NO2 gas and O2 gas as shown
below:
2 N2O5 (g) → 4 NO2 (g) + O2 (g)
the following data table is obtained:
Time (sec)
[N2O5]
[O2]
0
0.200 M
0
300
0.180 M
0.010 M
600
0.162 M
0.019 M
900
0.146 M
0.027 M
1200
0.132 M
0.034 M
1800
0.110 M
0.045 M
2400
0.096 M
0.052 M
3000
0.092 M
0.054 M
(a) Use the [O2] data from the table to calculate the average rate over the measured
time interval from 0 to 3000 secs.
(b) Use the [O2] data from the table to calculate the instantaneous rate early in the
reaction (0 secs to 300 sec).
(c) Use the [O2] data from the table to calculate the instantaneous rate late in the
reaction (2400 secs to 3000 secs).
