The vapor pressures of solid ammonia and liquid ammonia as a function of temperature respectively are given by In p = 23.03 - 3754/T and by In p = 19.09 -3063/T (where T is in Kelvin and p is in mm Hg). a. Calculate the triple temperature and pressure (Tt, pt) in the appropriate units. b. Calculate the latent heat of sublimation and the latent heat of evaporation at the triple point. c. Sketch the p-T diagram of the gas above the triple point.

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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.