L15-posting

L15-posting - 1 Lecture 15 Too Full: Two-Phase Equilibria...

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Unformatted text preview: 1 Lecture 15 Too Full: Two-Phase Equilibria Key Idea: There is a limit to how much liquid or solid will evaporate, sublimate, or dissolve. Put water in a sealed, initially evacuated flask: A Dynamic Equilibrium ! H 2 O ( l ) H 2 O( g ) Time 0 Time 1 Time 2 Equilibrium How much water vapor is present at equilibrium at 25 o C? 1.000 760 100 0.467 355.26 80 0.197 149.44 60 0.073 55.34 40 0.062 47.08 37 0.042 31.83 30 0.031 23.76 25 0.023 17.54 20 0.012 9.21 10 0.006 4.58 P (atm) P (torr) T(C) Vapor Pressure of Water 0.000 0.200 0.400 0.600 0.800 1.000 1.200 10 20 30 40 50 60 70 80 90 100 Temperature (Celsius) Pvap (atm) K = P H2O (T) = 0.03 atm at 25 o C Preclass Assignment data for equilibrium water vapor pressure: The equilibrium vapor pressure is constant , independent of the amount of liquid, as long as liquid is present. 1.000 760 100 0.467 355.26 80 0.197 149.44 60 0.073 55.34 40 0.062 47.08 37 0.042 31.83 30 0.031 23.76 25 0.023 17.54 20 0.012 9.21 10 0.006 4.58 P (atm) P (torr)...
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L15-posting - 1 Lecture 15 Too Full: Two-Phase Equilibria...

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