Determine the amount of heat, in kJ, required to heat 26 g of liquid Ca at 851C to 1146 C. Melting Point = 851C Boiling Point 1487C Molar Heat Capacities: Csolid = 26.2 J/mol C C liquid = 31.0 J/molC AH_fusion = 9.33 kJ/mol ΔΗ_vaporization = 162 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.