Mass of flask, Al foil and Cu wire (g): 90.4576 g Mass of flask, Al foil, Cu wire and condensed vapor (g): 90.8488 Temperature of vapor (℃): 100.5 Volume of flask (mL): 154 Barometric pressure (mmHg): 746.5   Determine the molar mass of the vapor molar mass= mass/moles

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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.