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final_part2

# final_part2 - 3.091 Fall Term 2004 Final Exam page 10...

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3.091 Fall Term 2004 Final Exam page 10 Problem #8 (7 points) (a) Lead chloride dissolves in water according to PbCl 2 (s) = Pb 2+ ( aq ) + 2 Cl ( aq ) The solubility in pure water has been measured to be 4.44 g L –1 . Calculate the solubility product of lead chloride in pure water. 3 (b) Calculate the solubility of lead chloride in a 3.091 × 10 –4 M potassium chloride (KCl) solution. Express your answer in moles PbCl 2 per liter of solution ( M ). Regardless of what answer you obtained in part (a), in this calculation use the value of 3.091 × 10 –5 for K sp of lead chloride. 4

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3.091 Fall Term 2004 Final Exam page 11 Problem #9 (8 points) (a) Sketch a fragment of the (111) plane in gold (Au) to show the arrangement of atoms which are to be represented as hard spheres. Show at least six atoms. 2 (b) On the sketch you have drawn in answer to part (a), label all directions in which slip occurs. 3 (c) Calculate the atomic packing density in the (111) plane of gold (Au). Express your answer in units of atoms cm –2 . 3
3.091 Fall Term 2004 Final Exam page 12 Problem #10 (3 points) The crystal structure of cesium chloride (CsCl) is shown in the adjacent figure. The dark spheres represent atoms of Cl.

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