Question

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

Answer 1

Answer:

TO CALCULATE DENSITY,Divide the mass by the volume . Density is usually _

Explanation:

g/mL .1 mL = 1 cm*3

38.5/45 =8.555 g/mL

this must be toluene

Answer 2

The substance identified  is Toluene.

Explanation:

• The formula to calculate the density is d = m/v where, m is the mass and v is the volume of the given compound.
• Here, volume of unknown compound is 45 mL and mass is 38.5 g.
• If we calculate the density by dividing 38.5 by 45 we get 0.855 which is closed to the density provided of toluene i.e 0.866 g/mL.
• Thus, the given unknown compound is Toluene.