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Unformatted text preview: --as drawn. ~ x 5 Calculate the density of the PCC compound, LiP. The ionic radii are 0.068 and 0.133 nm, respectively. Avagadro's number is 0.6022 x 1024; the amu are 6.94 and 19.00 for Li and P, respectively. Express your answers as g!cm3 or Mg!m3. Mass of Unit Cell Density = Volume of Unit Cell FCC compound, hence 4 of each per cell and 2R + 2r = a Hence, D = 4(6.94 + 19.00)/0.6022 x 1024 23(0.068 + 0.133? x 10-27-the 10-27 is (nmf to m3 D -W Mg/m3 6 Calculate the packing factor of CsCI. The ionic radii are Cs = 0.169 nm and CI = 0.181 nm. Recollect that CsCI does J1Q.1; have the same structure as NaCI (or LiP)! One kind of ion is at the cell comer, the other at the cell center. There is, on average, one of each type per cell The contact along the cube diagonal, so 2R + 2r = . .[ja...
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- Fall '11
- Ion, Cubic Unit Cell, total plane area