ocr: CHAPTER 11 Solutions to Exercises Intermolecular Forces, Liquids and Solids 11.55 In the face-centered cubic structure, there are four NiO units in the unit cell. Density is the mass of the unit cell contents divided by the unit cell volume (a). density = 4NIO (4.18A)3 units X 6.022x1 74.7g 1023 NiO Nio units X - 1x10-8 1A cm - 6.799 cms 11.56 There are four PbSe units in the unit cell. The unit cell edge is designated a. 1A 73 8.27 gicm3 = 4PbSe a3 units X 6.022 x 1023 286.2g PbSe units X 10cm a-229.87 A3, a= 6.13A 11.57 The volume of the unit cell is (2.86 X 10-8cm). The mass of the unit cel ...
