Dimensional Analysis

Question

A chemist needs 2.1347 g of a liquid compound. What volume of the compound is necessary if the density of the liquid is 0.7217 g/cm? If the compound costs $6.41 per milliliter, what is the cost of 2.1347 g?   

Answer 1

Volume = mass/ density = 2.1347g/0.7217g/cm^3 = 2.9579 cm^3

Cost of compound: $6.41

(2.9579 ml) ($6.41/ml) = $18.96 = $19.0 (three sig figs)