What is the pressure of hydrogen gas alone? Atmospheric pressure = 765 mmHg Volu
ID: 501939 • Letter: W
Question
What is the pressure of hydrogen gas alone?
Atmospheric pressure = 765 mmHg
Volume of hydrogen gas collected = 60 mL
Temperature = 25oC
Partial pressure of water at 25oC = 23.8 mmHg
Temperature
(°C)
Partial Pressure of Water
(mm Hg)
15
12.8
16
13.6
17
14.5
18
15.5
19
16.5
20
17.5
21
18.6
22
19.9
23
21.0
24
22.4
25
23.8
26
25.2
27
26.7
28
28.3
29
30.0
30
31.8
Temperature
(°C)
Partial Pressure of Water
(mm Hg)
15
12.8
16
13.6
17
14.5
18
15.5
19
16.5
20
17.5
21
18.6
22
19.9
23
21.0
24
22.4
25
23.8
26
25.2
27
26.7
28
28.3
29
30.0
30
31.8
Explanation / Answer
Ptotal = Pgas + Pvapor
Ptotal = 765 mm Hg
Pvapor = 23.8
therefore
Pgas = Ptotal - PVapor
Pgas = 765-23.8
Pgas = 741.2 mm Hg; that is, the pressure of Hydrogen alone
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