Answer with Explanation:
Density of copper(Cu)=[tex]\rho_{Cu}=8.96g/cm^3[/tex]
Density of zinc(Zn)=[tex]\rho_{Zn}=7.13 g/cm^3[/tex]
Atomic mass of copper=[tex]63.546 g[/tex]
Atomic mass of zinc=65.38 g
We know that
Volume=[tex]\frac{mass}{\rho}[/tex]
Using the formula
Volume of copper=[tex]\frac{63.546}{8.96}=7.09 cm^3[/tex]
Volume of zinc=[tex]\frac{65.38}{7.13}=9.17 cm^3[/tex]
Volume is inversely proportional to the density.
Pre -1982 penny made by copper and post-1982 penny made by zinc.
Therefore, volume of post-1982 penny is greater than the volume of pre-1982 penny because density of zinc is less than the density of copper.
