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CHM101H1 (19)
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Tutorial 2_Solution .pdf

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Department
Chemistry
Course
CHM101H1
Professor
Dan Dolderman
Semester
Winter

Description
APS 104 Tutorial 2 Name ……………………… Student number ……………………… Tutorial Number ………… 1. Compute the atomic packing factor for cesium chloride CsCl using the ionic radii in Table 3.4 and assuming that the ions touch along the cube diagonals. (0.4 mark) Cl- Cs+ Solution 4 4 4 VS = r3 + r3   ()(0.170nm)3 + (0.181 nm)  0.0454 nm 3 3 Cs 3 Cl 3 For CsCl the unit cell edge length, a, in terms of the atomic radii is just   2r + 2r Cs+ Cl- 2(0.170nm) + 2(0.181nm) a  3  3 = 0.405 nm Since V C a 3 , V C (0.405 nm) = 0.0664 nm 3  3 And, finally the atomic packing factor is just APF  VS  0.0454 nm  0.684 V 0.0664 nm3 C  2. Calculate the density of sodium (Na) metal. Radius of Na atom is 0.186 nm. (0.3 mark) APS 104 Tutorial 2 Name ……………………… Student number ……………………… Tutorial Number ………… 3. Compute the theoretical density of ZnS given that the Zn—S distance and bond angle are 0.234 nm and 109.5°, respectively. (0.3 mark) Hint: ZnS is ceramic materials with zinc blende crystal structure; h= a/4 S
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