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Quiz 9 Chemical Engineering Thermodynamics

March 17, 2016

-Indicate the state of ethane (vapor, liquid, solid) under these conditions. -For part a, include the chart with your answer sheet showing determination of values. -For part b, use the Peng-Robinson function given below (use constants to three sig. figs.).

-Indicate the state of n-pentane (vapor, liquid, solid) under these conditions. -Ensure that the conditions of applicability for the virial equation are appropriate. -Use the short-cut method. -Also use the Antoine equation and compare the results.

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Zc = Pc Vc/(RTc)

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0.1 1 10

100-300-200

-1000

100200

300400

500600

700800

Enthalpy [kJ/kg]

Pressure [MPa]

T=-80 T=-70

T=-60 T=-50

T=-40

T=-30

T=-20

T=-10

T=0T=10

T=20

T=-50

T=0

T=50

T=100

T=150

T=200

S=4.0

S=4.5

S=5.0S=5.5

S=6.0S=6.5

S=7.0

S=7.5S=8.0

S=8.5

EthaneP

ressure-Enthalpy D

iagramS

=Specific E

ntropy, kJ/kg*KT=Tem

perature, ºC

Ethane

Produced by I. A

artun, NTN

U 2002. B

ased on the program A

llprops, C

enter for Applied Therm

odynamic S

tudies, University of Idaho.

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ANSWERS: Quiz 9 Chemical Engineering Thermodynamics

March 17, 2016 9.6

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