To get the number of gold atoms, you have to divide the mass of the gold by the mass of the gold atom. It follows this simple equation [tex] \frac{mass of gold}{mass of gold atom} [/tex].
Let x be the number of gold atoms. Plug in the values to a calculator.
x = [tex] \frac{5.00g}{3.271 x 10-22g} [/tex]
Both have the same units so the unit gram(g) can be cancelled.
x then would be equal to 1.53x10^22. So there are 1.53x10^22 atoms of gold in 5 g of gold
