# PS6 - predictions with experimental data, at right. T, ° C...

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ChBE 3110, Fall Semester, 2009 Chemical Engineering Thermodynamics II Problem Set Six 1. Thermodynamics tables and charts may be used when both H and S are tabulated. Since G = H – TS , at constant temperature, Δ G = RT ln (f 2 /f 1 ) = H – T S . If state 1 is at low pressure where the gas is ideal, then f 1 = P 1 , RT ln (f 2 /P 1 ) = H – T S , where the subscripts indicate states. Use this method to determine the fugacity of steam at 400 °C and 15 MPa. What value does the fugacity coefficient have at this pressure? 2. (2000 solution) Find a general expression for the second virial coefficient for the square-well potential in terms of the parameters σ , ε and R σ . Use the values for argon, σ = 3.067 Å, ε /k = 93.3 ºK, R = 1.70 and compare the square-well
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Unformatted text preview: predictions with experimental data, at right. T, ° C B, cc/gmole -188.36 -249.34 -130 -94.42 -25 -28.57 -50 -11.24 125 0.96 300 10.77 600 19.48 3. Derive the formula for fugacity according to the van der Waals equation. Use the result to calculate the fugacity of ethane at 320 K and at a molar volume of 150 cm 3 /mole. Also calculate the pressure in bar. 4. The solubility of CH 4 (2) in CCl 4 (1) at 25ºC and 1 atm is x CH4 = 0.00284. Virial coefficients are B 11 = -1466 cc/gmole ; B 12 = -239 cc/gmole; B 22 = -41.4 cc/gmole. Using these data, estimate the composition of both the liquid and vapor phases for the system CH 4-CCl 4 at 25ºC and 20 atm. ε R σ σ...
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## This note was uploaded on 10/18/2009 for the course CHBE 3110 taught by Professor Staff during the Spring '08 term at Georgia Tech.

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