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Lesson_10_-_Example_Solutions-2009

Lesson_10_-_Example_Solutions-2009 - Lesson 10 Example 10-1...

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Lesson 10 Example 10-1 In some areas, the winter snow sublimes into the air without melting. Use the heat of sublimation and the vapour pressure of ice at 0 o C to determine how low the partial pressure of water vapour in air above ice at – 20 o C must be for ice to sublime. Data : H sub = 50.02 kJ/mol at 25 o C P vap (0 o C) = 4.579 mmHg. Data: T 1 = 0 o C = 273 K P vap ,1 = 4.579 mmHg T 2 = -20 o C = 253 K Clapeyron equation: 1
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Lesson 10 - = 2 1 sub 1 vap 2 vap T 1 T 1 R H P P ln - = 2 1 sub 1 vap 2 vap T 1 T 1 R H exp P P mmHg 802 . 0 K 253 1 K 273 1 kJ 10 315 . 8 K mol mol kJ 02 . 50 exp ) mmHg 579 . 4 ( P 3 2 vap = - × = - Therefore, the maximum concentration of water in the atmosphere is: ( 29 ( 29 ( 29 L / mol 10 09 . 5 K 253 K . mol / atm . L 082 . 0
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