Elementary Principles 275 - 7.51(cont'd Substituting(3(4(5...

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7-30 7.51 (cont’d) Substituting (3), (4), (5), and (6) in (7) Q Q = + + + ++ −⇒ = 0 446 0 625 01045 90 3325 0 446 1 0 625 01304 90 37 57 0554 0 399 01356 90 0554 1 0 399 01674 90 05 01356 130 05 01674 130 814 .( .) [ . ( ) . ].( [ . ( ) . ] . ( . )[ . ( )] . ( . )[ . ( )] . [ . ( )] .[ . ( )] . kJ / mol (c). If P<P min , all the output is vapor. If P>P max , all the output is liquid. (d) At P=652 mmHg it is necessary to add heat to achieve the equilibrium and at P=714 mmHg, it is necessary to release heat to achieve the equilibrium. The higher the pressure, there is more liquid than vapor, and the liquid has a lower enthalpy than the equilibrium vapor: enthalpy out < enthalpy in. z B T P p B p T x B y B n V n L Q 0.5 90 652 1021 406.7 0.399 0.625 0.446 0.554 8.14 0.5 90 714 1021 406.7 0.500 0.715 -0.001 1.001 -6.09 0.5 90 582 1021 406.7 0.285 0.500 0.998 0.002 26.20 0.5 90 590 1021 406.7 0.298
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