c. Iron crystalizes in a body-centered cubic unit. The edge of this cell is 287 pm. Calculate the density of iron. d. Copper crystallzzes in a face-centered cubic unit cell. The dentily of copper is 8.94gcm3. Calculate the length of the edge of the unit cell in pm. CHEM102 Home Work 2 Chapter 11: Intermolecular forces and liquids and solids e. Which would be expected to be more viscous CiHu or Cshidi(OH)? f. Which would be expected to have the larger molar heat of vaporization (AHen), Hase or H2O ? 9. Osmium tetroxide, OsO, is a soff crystal that melts at 40C. The liquid does not conduct electrialty. What kind of crystal is this? h. All intermolecular forces must be overcome in order for a substance to undergo a phase change from a solid to a liquid. True or False? Explain. 1. All intermolecular forces must be overcome in order for a substance to undergo a phase change from a liquid to a gas. True or False? Explain