Ionic and Molecular Solids (Sections)
A particular form of cinnabar (HgS) adopts the zinc blende structure. The length of the unit cell edge is 5.852 Å (a) Calculate the density of HgS in this form, (b) The mineral tiemmanite (HgSe) also forms a solid phase with the zinc blende structure. The length of the unit cell edge in this mineral is 6.085 Å. What accounts for the larger unit cell length in tiemmanite
(c) Which of the two substances has the higher density? How do you account for the difference in densities?
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