Q4 - | Name:_ Student Number:_ CHM2132 Quiz 4 1. On a cold,...

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| Name:_______________________________ Student Number:______________________________ CHM2132 Quiz 4 1. On a cold, dry morning after a frost the temperature was -5 o C and the partial pressure of water in the atmosphere was 0.20 kPa. Will the frost sublime? What partial pressure of water would ensure that the frost remained? You must show your work. (5 marks) 1 016 . 44 = Δ kJmol H m vap 1 008 . 6 = Δ kJmol H m fus T Triple Point = 273.15 K p Triple point =0.006 atm = 607.95 Pa ln p 2 p 1 =− Δ vap H m R 1 T 2 1 T 1 Δ sub H m vap H m fus H m = 44.016 kJ mol -1 + 6.008 kJ mol -1 = 50.024 kJ mol -1 Since T Triple Point = 273.15 K and p Triple point =0.006 atm ln p 2 Δ vap H m R 1 T 2 1 T 1 + ln p 1 = 50024 J mol -1 8.314 J K -1 mol -1 1 273 - 5 () K 1 273.15 K + ln 0.006 = 2.16 p 2 = 0.0039 atm=0.4 kPa
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This note was uploaded on 11/13/2010 for the course CHM CHM2132 taught by Professor Goto during the Fall '07 term at University of Ottawa.

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