# UCI CBEMS 45C - HW8_45C_Sp15 (2 pages)

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## HW8_45C_Sp15

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## HW8_45C_Sp15

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School:
University of California, Irvine
Course:
Cbems 45c - Chem Eng Thermodyns
##### Chem Eng Thermodyns Documents
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Homework 8 CBEMS 45C Sp15 due Friday June 5 at the beginning of lecture 1 Lifelong Learning Find an external resource broadly defined that could be useful to you for the remainder of this class or in applying 45C concepts to future study This has to be something OTHER than the textbook It could be software videos texts or even a professional educational society Write down what the resource is and how it could help you in ongoing learning application of thermodynamics 2 For a binary mixture of n butane and n hexane with butane mole fraction xB 0 7 at T 450 K and P 500 kPa answer the following questions a Considering the pure components separately determine whether you are possibly dealing with a two phase mixture or not b Assuming there is no change in volume upon mixing of the pure components at the temperature and pressure of interest calculate the fugacity of each component 3 Problem 10 1 6 Relative humidity is the ratio of the partial pressure of water in air to the partial pressure of water in air saturated with water at the same temperature expressed as a percentage Relative humidity Partial pressure of water in air 100 Partial pressure of water in air saturated with water at same temperature Among aviators it is more common to express the moisture content of the air by giving the air temperature and its dew point that is the temperature to which the air must be cooled for the first drop of water to condense The following atmospheric conditions 1 have been reported Atmospheric pressure 1 011 bar Air temperature 25 6 C Dew point of air 20 6 C What is the relative humidity of the air see problem 7 12 for the necessary data Hint Assume air is made up of N2 O2 and water vapor What is Tc for O2 and N2 Do we need to consider liquid O2 and N2 at the dew point 4 What is the lowest temperature to which a vapor mixture of 1 mole n pentane and 2 moles n hexane at 1 bar can be brought without forming liquid Assume the liquid forms an ideal solution Use the Antoine equation ln P sat in bar A B T in K C Antoine coefficients Name A B C n pentane n hexane 9 2131 9 2164 2477 07 2697 55 39 94 48 78 2

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