900 800- 700 600 500 400 300 200 100 Vapor pressure (mm Carbon disulfide Methano 0. 10 20 30 40 Ethandl Heptane 50 60 70 80 90 100 Temperature (°C) 110 From the plot of vapor pressures vs temperature above, estimate the boiling point of methanol when the external pressure is 182 mm Hg. "C

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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.