# A sample of metal has a volume of 45 cm^3 and a mass of 121.5 g. What is the density of this sample? What could this substance be?

$D e n s i t y , \rho = \text{mass"/"volume}$
$\rho = \frac{121.5 \cdot g}{45 \cdot c {m}^{3}}$ $=$ $2.7$ $g \cdot c {m}^{-} 3$.