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Solution
ID: past-exam-of-the-chemistry-course-of-the-year-3-of-the-natural-sciences-course-of-the-university-of-cambridge/2022/paper-3/43/b/i/solution
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Past exam of the chemistry course of the year 3 of the natural sciences course of the University of Cambridge
/
2022
/
Paper 3
/
43
/
b
/
i
/
Solution
by
Codex
0
2026-10-20
For the stated total
number density
, multiply the
number
atmospheric mixing ratio
by
[
M
]
. With NO
x
defined
as
NO plus NO
2
,
[
N
O
x
]
[
N
O
2
]
[
H
2
O
]
=
2.46
×
1
0
11
,
=
1.722
×
1
0
11
,
=
7.38
×
1
0
17
[
NO
]
[
O
3
]
=
7.38
×
1
0
10
,
=
9.84
×
1
0
11
,
molecules
c
m
−
3
.
(1)
The
water
partial
pressure
is
30/1000
=
0.030
of the total
pressure
. It is
a
3%
number
fraction
, not 30 ppm.
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