Many compounds used in the fragrance industry are derived from plant extracts. One step in identifying a desired compound is the determination of its molar mass. The volatile organic compound geraniol is a component of oil of roses. The density of the vapor at 260. °C and 103 Torr is 0.480 g · L^–1. What is the molar mass of geraniol?

ANTICIPATE Because the compound is volatile, you should anticipate that it will have a moderately low molar mass.

PLAN List the information given and convert the temperature into an absolute value in kelvins. Then rearrange Eq. 8 into an expression for M, select a value of R with appropriate units, and substitute the data.

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Density = mass m nM volume V nV m || M MP Vm RT m II (8)