To identify a liquid substance, a student determined its density. Using a graduated cylinder, she measured out a 45- sample of the substance.

To identify a liquid substance, a student determined its density. Using a graduated cylinder, she measured out a 45- sample of the substance. She then measured the mass of the sample, finding that it weighed 38.5 . She knew that the substance had to be either isopropyl alcohol (density 0.785 ) or toluene (density 0.866 )