che359_sp10_hw7_solution - Page 1 of 3 ChE 359 Homework #7...

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Unformatted text preview: Page 1 of 3 ChE 359 Homework #7 due Tuesday, April 1, 2010 at 2:30 pm 1. (15 points) You are adding a perfuming agent to a liquid aerosol spray. You want its vapor pressure to double if the temperature increases from 25 C to 35 C. Calculate the pair interaction energy w AA that the perfuming agent has in the pure liquid state. You can assume that the number of nearest neighbor molecules in the liquid is z = 6. Vapor pressure is given by = p exp( 2 ?? ) , we want 2 1 = exp 2 ? ( 1 ? 2 1 ? 1 ) = 2, = 6, ? = 2 , ? 2 ? ( 1 ? 2 1 ? 1 ) = 2 ? = 2 ? 2 ( 1 ? 2 1 ? 1 ) = 2 2 2 6( 1 308 1 298 ) = 4.24 2. (15 points) A fluid has a boiling temperature T = 300 K at p = 1 atm. The enthalpy of vaporization is h vap = 10 kcal/mol. Suppose you make a molecular modification of the fluid that adds a hydrogen bond, so that the new enthalpy of...
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This note was uploaded on 02/09/2011 for the course CHE 359 taught by Professor Cynthialo during the Spring '10 term at Washington University in St. Louis.

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che359_sp10_hw7_solution - Page 1 of 3 ChE 359 Homework #7...

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