Quiz 10 Chemical Engineering Thermodynamics

March 23, 2017 Determine the fugacity (MPa) for ethane at (a) 7°C (280°K) and 1 MPa and (b) 7°C (280°K) and 4.0 MPa using the virial equation and the shortcut vapor pressure. Tc = 305.3 °K, Pc = 4.9 MPa , Vc = 147 cm3/mole, ω = 0.099, R = 8.314 J/(mole °K) = 8.314 cm3MPa/(mole°K) Determine if the short cut method is appropriate. Calculate the vapor pressure and determine the state for each condition. Determine if the virial equation is appropriate. (Accept if you are within 10% of the criterion) Calculate the fugacity (using different methods for the different states).

Zc = Pc Vc/(RTc)

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

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