Knowing that delta H_VAP for water is 40.7 kJ/mol, calculate P_VAP of water at 5
ID: 492227 • Letter: K
Question
Knowing that delta H_VAP for water is 40.7 kJ/mol, calculate P_VAP of water at 58 degree C 5.3 torr 456 torr 14.8 torr 759 torr 144 torr Below is a phase diagram for compound Q. You wish to purify a sample of Q that was collected at P = 1.0 atm and T = 100 K by subliming it. In order to sublime the sample, you should: Increase P to 1.5 atm and then increase T to 300K. Increase T to 300 K, keeping P = 1.0 atm. Lower P to 0.5 atm and then increase T to 200 k. Increase T to 300 K, and then lower P to 0.5 atm. Abandon the attempt to sublime Q.Explanation / Answer
(1)
T1 = 373 K ; T2 = 331 K
we know that,
ln(P2/P1) = delta H/R x (1/T1- 1/T2)
ln(P2/760) = 40700/8.314 ( 1/373 - 1/331 )
P2 = 143.74 Torr == 144 Torr
(2) Sublimation is process from solid to gas.
Here if we decrease pressure to 0.5 atm and then increase temperature we can go directly from solid to gas phase without interaction of liquid
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