How much heat energy is required to convert 84.0 g (1.82 mol) of liquid ethanol (C2H5OH) at 50.0 °C to gaseous ethanol at 78.4 °C? Melting point of ethanol = Boiling point of ethanol = Molar heat of fusion of ethanol = F114.5 °C 78.4 °C %3D 4.60 kJ/mol Molar heat of vaporization of ethanol = 38.56 kJ/mol Specific heat capacity of liquid ethanol = Specific heat capacity of gaseous ethanol = 1.43 J/g°C 2.45 J/g°C %3D 5.88 x 103 kJ 3.21 x 103 kJ 81.2 kJ 73.4 kJ 1.10 x 104 kJ 76.0 kJ

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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.