ECE331_hw7_solution

ECE331_hw7_solution - ECE331 Homework#7 Solution 1 This...

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1 ECE331 Homework #7 Solution 1. This problem asks us to consider a specimen of ice I which is at -15 ° C and 10 atm pressure. (a) In order to determine the pressure at which melting occurs at this temperature, we move vertically at this temperature until we cross the Ice I -Liquid phase boundary of Figure 9.2. This occurs at approximately 100 atm; thus the pressure of the specimen must be raised from 10 to 570 atm. (b) In order to determine the pressure at which sublimation occurs at this temperature, we move vertically downward from 10 atm until we cross the Ice I -Vapor phase boundary of Figure 9.2 This intersection occurs at approximately 0.003 atm. Note: In some textbooks, this problem asks the pressures at -25 ° C. In this case, one would have to estimate the pressure values through an extrapolation of boundary line. The answers are roughly 1300 atm and 0.0015 atm, respectively. 2. Upon heating a lead-tin alloy of composition 30 wt% Sn-70 wt% Pb from 150 ° C and utilizing Figure 9.8: (a) the first liquid forms at the temperature at which a vertical line at this composition intersects the eutectic isotherm--i.e., at 183
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