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Unformatted text preview: solid or liquid OVER . .. 2. (8 pts) Copper metal, with an atomic radius of 1.347 Å, crystallizes in a face-centered-cubic unit cell. (At. wt.: Cu = 63.55) (1 Å = 1 x 10-8 cm, N A = 6.02 x 10 23 ) (a) Determine the density of copper metal (in g/cm 3 ). (b) What is the coordination number of Cu in this structure? 3. (4 pts) Answer the following questions about NaCl. (a ) Describe the NaCl unit cell (i.e. Where are the cations and anions located in the unit cell and how many NaCl formula units are there in the unit cell?). (b) What is the number of nearest neighbors (coordination number) of Cl ! in this structure and what ions are its nearest neighbors? 4. (3 pts) Calculate the mass percentage of a solution of 25.5 g of phenol (C 6 H 5 OH) in 495 g of ethanol (CH 3 CH 2 OH)....
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