Problem: 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 ).A cubic piece of metal measures 5.50 cm on each edge. If the metal is nickel, whose density is 8.90 g/cm3, what is the mass of the cube?

FREE Expert Solution

We are asked to calculate the mass of the cube.


Calculate volume: 

V = s3V =(5.50 cm)3

V = 166.375 cm3 


Calculate the mass: 

density = massvolume


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Problem Details
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 ).


A cubic piece of metal measures 5.50 cm on each edge. If the metal is nickel, whose density is 8.90 g/cm3, what is the mass of the cube?

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What scientific concept do you need to know in order to solve this problem?

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