1. The vapor pressure of an unknown liquid was measured as described in this experiment: Pressure Measurements Temp. °C VP Temp. (in Kelvin) (mm Hg) In VP 1/T (mm Hg) Observed Air Pressure 5.5 773.1 731.3 41.8 21.3 837.0 736.7 41.0 983.3 750.5 a. Fill in the rest of the table above. The observed vapor pressure is actually the sum of the vapor pressure of the unknown liquid and the pressure of air in the flask. In order to determine the vapor pressure of liquid you need to subtract the air pressure from the observed pressure. Note that the pressure of air in the flask changes with temperature. Show your calculations in the space below.

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A:

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A:

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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.