Chemistry Reference
In-Depth Information
Vapor Pressure of Water
o
C
mm of Hg
kPa
o
C
mm of Hg
kPa
0
4.6
0.61
26
25.2
3.36
5
6.5
0.87
27
26.7
3.57
10
9.2
1.23
28
28.3
3.78
15
12.8
1.71
29
30.0
4.01
16
13.6
1.82
30
31.8
4.25
17
14.5
1.94
35
42.2
5.63
18
15.5
2.06
40
55.3
7.38
19
16.5
2.19
50
92.5
12.34
20
17.5
2.34
60
149.4
19.93
21
18.6
2.49
70
233.7
3.18
22
19.8
2.64
80
355.1
47.37
23
21.1
2.81
90
525.8
70.12
24
22.4
2.98
100
760.0
101.32
25
23.8
3.17
110
1074.6
143.28
Figure 8-4a
Let's see an example of how this chart would be used.
Example 4
A student collects hydrogen by displacing water. The mixture she
collects exerts a total pressure of 743.3 mm of Hg at 25
o
C. What is
the pressure of just the dry hydrogen gas?
Working with the formula for Dalton's Law, we get the following:
P
2
= P
total
- P
1
or
P
dry hydrogen
= P
total
- P
H
2
O
