How many atoms are there in 0.32g of copper

The number of atoms that are in 0.32 g of copper are

3.01 x10^21 atoms

calculation

Step 1: find the number of moles of Copper

moles = mass/molar mass

= 0.32 g / 63.5 g/mol=0.005 moles

Step 2: use the Avogadro's constant to determine the number of atom

in 0.005 moles of Cu

that is according to Avogadro's law 1 mole = 6.02 x10^23 atoms

0.005 moles=? atoms

by cross multiplication

= (0.005 moles x 6.02 x10^23 atoms) / 1 mole = 3.01 x10 ^21 atoms