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Chapter 10: Q79E. (page 592)
Cobalt metal crystallizes in a hexagonal closest packed structure. What is the coordination number of a cobalt atom?
The coordination number of cobalt in hexagonal closest packing structure is 12.
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What phase changes will take place when water is subjected to varying pressure at a constant temperature of \({\rm{0}}{\rm{.00}}{{\rm{5}}^{\rm{o}}}{\rm{C}}\)? At \({\rm{4}}{{\rm{0}}^{\rm{o}}}{\rm{C}}\) ? At \({\rm{ - 4}}{{\rm{0}}^{\rm{o}}}{\rm{C}}\)?
The free space in a metal may be found by subtracting the volume of the atoms in a unit cell from the volume of the cell. Calculate the percentage of free space in each of the three cubic lattices if all atoms in each are of equal size and touch their nearest neighbours. Which of these structures represents the most efficient packing? That is, which one of them packs with the least amount of unused space?
The white pigment titanium oxide crystallizes with titanium ions in one-half of the octahedral holes in a closest-packed array of oxide ions. What is the formula of titanium oxide?
What types of liquids typically form amorphous solids?
Carbon tetrachloride, \({\rm{CC}}{{\rm{l}}_{\rm{4}}}\), was once used as a dry-cleaning solvent, but is no longer used because it is carcinogenic. At \({\bf{57}}.{\bf{8}}\)掳C, the vapor pressure of \({\rm{CC}}{{\rm{l}}_{\rm{4}}}\) is \({\bf{54}}.{\bf{0}}\)kPa, and its enthalpy of vaporization is \({\bf{33}}.{\bf{05}}\)kJ/mol. Use this information to estimate the normal boiling point for \({\rm{CC}}{{\rm{l}}_{\rm{4}}}\).
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