CHE222_solutions7

# CHE222_solutions7 - ChE 222 Problem Set#7 Due March...

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ChE 222: Problem Set #7 Due: March 14,2008 (8:OO am) (9) 1 .) Koretsky, Problem 2.52 ( 3Y ) 2.) Felder and Rousseau, Problem 9.12 c ao) 3 Felder and Rousseau, Problem 9.14

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2.52 A mass balance shows To develop the energy balance, neglect kinetic and potential energy. Also, no shaft work is performed, so the energy balance becomes The energy balance can be expanded to If the reference state is set to be liquid propane at 0 OC and 4.68 bar, the internal energies become Once the change in internal energy for vaporization and temperature of state 2 is determined, Q can be solved. As the liquid evaporates, the pressure increases. At state 2, where saturated propane vapor is present, the ideal gas law states 1 To find v2, assume that v; >> vl . The volume of the rigid container is Therefore,
Also, since the propane is saturated, P2 and T2 are not independent of each other. They are related through the Antoine Equation, where pSat = P2 and T Sat = T2 Substitution provides, Using values from Table A. I. 1 and R = 8.3 14 x 10- To find Auvap, refer to the definition of enthalpy.

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CHE222_solutions7 - ChE 222 Problem Set#7 Due March...

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