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General Chemistry Principles, Patterns, and Applications, 2011

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Temperatures"). As shown in Figure 10.13 "A Plot of the Vapor Pressure of Water versus Temperature", the vapor<br />

pressure of water increases rapidly with increasing temperature, <strong>and</strong> at the normal boiling point (100°C), the vapor<br />

pressure is exactly 1 atm. The methodology is illustrated in Example 14.<br />

Table 10.4 Vapor Pressure of Water at Various Temperatures<br />

T (°C) P (in mmHg) T P T P T P<br />

0 4.58 21 18.66 35 42.2 92 567.2<br />

5 6.54 22 19.84 40 55.4 94 611.0<br />

10 9.21 23 21.08 45 71.9 96 657.7<br />

12 10.52 24 22.39 50 92.6 98 707.3<br />

14 11.99 25 23.77 55 118.1 100 760.0<br />

16 13.64 26 25.22 60 149.5 102 815.8<br />

17 14.54 27 26.75 65 187.7 104 875.1<br />

18 15.48 28 28.37 70 233.8 106 937.8<br />

19 16.48 29 30.06 80 355.3 108 1004.2<br />

20 17.54 30 31.84 90 525.9 110 1074.4<br />

Figure 10.13 A Plot of the Vapor Pressure of Water versus Temperature<br />

The vapor pressure is very low (but not zero) at 0°C <strong>and</strong> reaches 1 atm = 760 mmHg at the normal boiling point,<br />

100°C.<br />

E X A M P L E 1 4<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

934

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