A previous Chem 100 student carried out the experiment you did by reacting 0.04 g of magnesium. The following data was collected in their lab notebook. The water temperature was 19.8°C. The barometer in the lab read 757.9 mm Hg Sample of 36.2 mL of gas was collected The vapor pressure of water at this temperature is 17.32 mm Hg. Calculate the student's experimental value of R. Report your answer to three places after the decimal.

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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.