Calcium carbide reacts with water to produce acetylene(C2H2) and calcium hydroxide. The acetylene is collectedover water at 40.0°C under a total pressure of 0.9950atm. The vapor pressure of water at this temperature is0.0728 atm. Calculate the mass of acetylene per liter of“wet” acetylene collected in this way, assuming ideal gasbehavior.

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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.