E115_Problem_Set_15

E115_Problem_Set_15 - e 115 Engineering Thermodynamics...

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e 115 Engineering Thermodynamics Fall 2009 University of California Problem set 15 Due : Friday, October 16 th in lecture 1) ( 20 points ) This is a continuation of the problem started in the last problem set. Recall that the normal melting point of Ni is well defined. Quoted values for the melting point generally lie between 1453–1456°C, with the currently accepted melting point 1455.2°C often rounded to 1455°C. It is this rounded value that we will use as the normal melting point. The normal boiling point, defined as the temperature at which the vapor pressure of the liquid reaches one atmosphere (= 760 mm Hg) is not well defined. A quick look at twenty or so online reference sites will reveal that the quoted values range from as low as 2730°C to as high as 2987°C. This is a pretty large range both in absolute and normalized terms. Thermodynamic data exists for equilibrium between the vapor and the solid phase, and also for the vapor-liquid equilibrium. The vapor pressure expressions are given below. Note that the pressures
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E115_Problem_Set_15 - e 115 Engineering Thermodynamics...

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