III Calculations Involving the Equilibrium Constant A. One mole of acetic acid, CH3COOH, and 1 mole of ethanol, C2H5OH, were reacted in one- liter vessel and allowed to attain equilibrium at 25°C. The equilibrium mixture was then titrated with standard base and was found to contain 0.667 moles of acetic acid after the following reaction has taken place to form ethyl acetate and water. Supply the table and calculate the equilibrium constant (Kc) CH3COOH(soln) + C2H5OH(soln) C2H50OCCH(soln) H2O @) Initial 1.000 M 1.000 M Concentration Change in Concentration -0.667 M Equilibrium Concentration 0.333 M

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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.