The following information is given for antimony at latm: boiling point = 1440 °C AHvap(1440 °C) = 195 kJ/mol melting point = 631 °C AHfus(631 °C) = 19.6 kJ/mol specific heat solid= 0.209 J/g°C specific heat liquid= 0.259 J/g°C What is AH in kJ for the process of freezing a 29.9 g sample of liquid antimony at its normal melting point of 631 °C. 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.