Calculate the equilibrium number of vacancies per cubic meter for metal X at 448C. The energy for vacancy formation is 1 eV/atom; the atomic weight and density for Metal X are 62.6 g/mol and 2.6 g/cm3, respectively. Answer in scientific notation. Round your answer to 2 significant figures. Please answer the question ASAP. I need the answer in 40minute. Thank you.

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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.