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

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