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Question 13 A chemistry student needs 60.0mL of pentane for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of pentane is ·0.626gcm−3. Calculate the mass of pentane the student should weigh out. Be sure your answer has the correct number of significant digits.

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Answer:

37.6 grams of pentane

Explanation:

The density given in the CRC of 0.626 g/cm³ will be used to calculate the mass of pentane requred since Density = m/v and m= D x V

Be careful in this kind of questions to check for the units. In this case one has to remember 1 mL equal 1 cm³.

m = 0.626 g/cm³  x 60.0 cm³  = 37.6 g pentane

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