MSE101H1 Lecture Notes - Molecular Geometry, Ionic Radius, Zinc Sulfide
3 Feb 2014
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3. 3 molybdenum has a bcc crystal structure, an atomic radius of 0. 1363 nm, and an atomic weight of. Compute its theoretical density and compare it with the experimental value found inside the front cover. This problem calls for a computation of the density of molybdenum. For bcc, n = 2 atoms/unit cell, and realizing that vc = a3, and using equation 3. 3. 3 (2 atoms/unit cell)(95. 94 g/mol) (4)(0. 1363 10-7 cm) / 3. The value given inside the front cover is 10. 22 g/cm3. 3. 4 calculate the radius of a palladium atom, given that pd has an fcc crystal structure, a density of 12. 0 g/cm3, and an atomic weight of 106. 4 g/mol. For fcc, n = 4 atoms/unit cell, and vc = And solving for r from the above expression yields na. R = (4 atoms/unit cell) 106. 4 g/mol (16)(12. 0 g/cm3)(6. 02 1023 atoms/mol)( 2) = 1. 38 10-8 cm = 0. 138 nm.
