The sublimation pressures of solid Cl2 are 352 Pa at -112oC and 35 Pa at -126.5oC. The vapor pressures of liquid Cl2 are 1590 at -100oC and 7830 at -80oC. Calculate (a) △subH, (b) △vapH, (c) △fusH, and (d) the triple point. Answer: [31.4 kJ mol-1 ; 22.1 kJ mol-1 ; 9.1 kJ mol-1 ; -102oC

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Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.