# 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?

Sep 6, 2016

#### Answer:

$\text{Density, } \rho$ $=$ $\text{Mass"/"Volume}$

${\rho}_{\text{coin}}$ $\approx$ $7.13 \cdot g \cdot c {m}^{-} 3$

#### Explanation:

I have an idea that copper metal is denser than this. But as a scientist, you should look up the actual densities of coinage metals, i.e. gold, silver, copper, zinc, iron, nickel. Mind you, the coin is lkely to be an alloy, and have a particular density.