A student dissolves 111 g of compound Q in one liter of hot water. All of compound Q dissolves.  The student then cools the water to room temperature.  At room temperature, 9 g of compound Q dissolves in one liter of water.  How many grams of compound Q will recrystallize in the room temperature water?

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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.