Question

a block of aluminum occupies a volume of 15.0 ml and has a mass of 40.5 g. what is its density? (d = m/v)
a solid rubber stopper has a mass of 33.0 grams and a volume of 30.0 cm³. what is the density of rubber? (d = m/v)

Explanation:

Step1: Recall density formula

$D = \frac{M}{V}$

Step2: Calculate density of aluminum

Given $M_{aluminum}=40.5\ g$ and $V_{aluminum}=15.0\ mL$, then $D_{aluminum}=\frac{40.5\ g}{15.0\ mL}=2.7\ g/mL$

Step3: Calculate density of rubber

Given $M_{rubber}=33.0\ g$ and $V_{rubber}=30.0\ mL$, then $D_{rubber}=\frac{33.0\ g}{30.0\ mL}=1.1\ g/mL$

Answer:

The density of aluminum is $2.7\ g/mL$ and the density of rubber is $1.1\ g/mL$