Question

Help pleaseeeee
A graduated cylinder contains 20.0 mL of water. An irregularly shaped object is placed in the cylinder, and the water level rises to the 31.2 mL mark. If the object has a mass of 74.2 g, what is its density?

Answer 1

Density = mass/volume

Mass = 74.2 g
Volume = 31.2 mL - 20.0 mL = 11.2 mL

Density = 74.2 g/ 11.2 mL = 6.625 g/mL

Note that in multiplication and division problems such as this one, the final answer will be rounded to the least number of significant figures (sig figs) of the original numbers (the dividend and the divisor).

In this case, 74.2 and 11.2 both have three sig figs. Thus, round 6.625 to three sig figs.

FINAL ANSWER: Density = 6.63 g/mL

Hope this helps!