| Name:_______________________________ Student Number:______________________________ CHM2132 Quiz 41. On a cold, dry morning after a frost the temperature was -5oC 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) 1016.44−=ΔkJmolHmvap1008.6−=ΔkJmolHmfusTTriple Point= 273.15 K pTriple point=0.006 atm = 607.95 Pa lnp2p1⎛⎝⎜⎞⎠⎟=−ΔvapHmR1T2−1T1⎛⎝⎜⎞⎠⎟ΔsubHm=ΔvapHm+ΔfusHm=44.016 kJ mol-1+ 6.008 kJ mol-1=50.024 kJ mol-1Since TTriple Point= 273.15 K and pTriple point=0.006 atm lnp2ΔvapHmR1T2−1T1⎛⎝⎜⎞⎠⎟+lnp1=−50024 J mol-18.314 J K-1mol-11273 - 5 ()K−1273.15 K⎛⎝⎜⎞⎠⎟+ln 0.006=2.16p2=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.