An EPA standard for microparticulates in air is limited to a maximum of 50.0 Hg/m. Calculate the maximum Hg microparticulates allowed by EPA standards in a breath of air with a volume of O.500 L. O 0.0250 Hg O 1.00 x10 Hg O 2.50 x1010 Hg Ο 40.0 μg

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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.