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Question 12.31: Calculating the Partial Pressure of a Gas Collected over Wat......

Calculating the Partial Pressure of a Gas Collected over Water

What is the partial pressure of oxygen gas collected over water at 17°C on a day when the barometric pressure is 743 mm Hg?

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From Table 12.6, we determine that water has a vapor pressure of 14.5 mm Hg at 17°C.

Using the equation

P_{\textrm{O}_2} = P_{\textrm{atm}}  –   P_{\textrm{H}_2 \textrm{O}}

we find the partial pressure of the oxygen to be 728 mm Hg.

P_{\textrm{O}_2} = (743 – 14.5) mm Hg = 728.5 mm Hg      (calculator answer)
= 728 mm Hg          (correct answer)

TABLE 12.6 Vapor Pressure of Water at Various Temperatures

T(°C) Vapor Pressure

(mm Hg)

 T(°C) Vapor Pressure

(mm Hg)

 T(°C) Vapor Pressure

(mm Hg)
15 12.8 22 19.8 29 30.0
16 13.6 23 21.1 30 31.8
17 14.5 24 22.4 31 33.7
18 15.5 25 23.8 32 35.7
19 16.5 26 25.2 33 37.7
20 17.5 27 26.7 34 39.9
21 18.7 28 28.3 35 42.2

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