You have a 17 g sample of ethanol with a density of 0.7893 g/mL. What volume of ethanol do you have?

Question

You have a 17 g sample of ethanol with a density of 0.7893 g/mL. What volume of ethanol do you have? 

Answer 1

For this problem, you can simply use dimensional analysis:

17 g x 1 ml/0.7893 g = 21.5 ml = 22 ml (to 2 significant figures)...note how units of g cancel leaving mls.