# A new penny has a mass of 2.49 g and a volume of 0.349 cm^3. Is the penny made of pure copper? Wy or why not?

$\text{Density, } \rho$ $=$ $\text{Mass"/"Volume}$
${\rho}_{\text{coin}}$ $\approx$ $7.13 \cdot g \cdot c {m}^{-} 3$