SM_10B - Chapter 10 - Section B - Non-Numerical Solutions...

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Chapter 10 - Section B - Non-Numerical Solutions 10.5 For a binary system, the next equation following Eq. (10.2) shows that P is linear in x 1 . Thus no maximum or minimum can exist in this relation. Since such an extremum is required for the existence of an azeotrope, no azeotrope is possible. 10.6 ( a ) Because benzene and toluene are chemically similar and the pressure is only 1(atm), this system can be modeled by Raoult’s law to a good approximation. ( b ) Although n -hexane and n -heptane are chemically similar, a pressure of 25 bar is too high for modeling this system by Raoult’s law. ( c ) At 200 K, hydrogen is supercritical, and modeling the hydrogen/propane system at this tempera- ture by Raoult’s law is out of the question, because no value of P sat for hydrogen is known. ( d ) Because isooctane and n -octane are chemically similar and at a temperature (373.15 K) close to their normal boiling points, this system can be modeled by Raoult’s law to a good approximation.
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SM_10B - Chapter 10 - Section B - Non-Numerical Solutions...

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