B. Explain why the maximum vapor pressure and standard enthalpy of vaporization are different for the morning low temperature and the afternoon high temperature in the month of August in Philadelphia. a. Having trouble? Review questions from Chapter 10: 35, 37, and 47. Temperature Vapor Pressure Enthalpy of Vaporization Morning Low 70 °F 18.7 mmHg 44.16 kJ/mol Afternoon High 87 °F 33.7 mmHg 43.75 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.