Answer
$4.76\times10^{24}\,atoms$
Work Step by Step
$Radius=0.935\,in\times\frac{2.54\,cm}{1\,in}=2.3749\, cm$
$Volume=\frac{4}{3}\pi r^{3}=\frac{4}{3}\pi\times(2.3749\, cm)^{3}=56.1\,cm^{3}$
$Mass= Density\times Volume= 8.96g/cm^{3}\times56.1\,cm^{3}
=502.656\,g$
Number of moles of Cu=$\frac{Mass\,in\,grams}{Molar\,mass}=\frac{502.656\,g}{63.546\,g/mol}=7.91\,mol$
Number of atoms of Cu=$7.91\,mol\times\frac{6.022\times10^{23}}{1\,mol}=4.76\times10^{24}\,atoms$
