The vapor pressure of a volatile liquid was measured at several different temperatures and graph of the ln P vs 1/T was prepared which resulted in a straight line with a negative slope.  If the equation of the line was found to be( y= -1640.3 K + 34.8 ) what is the enthalpy of vaporization ( ΔHvap ) for the liquid? Select one: a. 1640.3 kJ/mol b. -13.6 kJ/mol c. 13.6 kJ/mol d. -1640.3 Kj/mol e. 289 kJ/mol

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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.