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?
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.