How many ions in 6 grams of copper?

atomic wt of copper=64

therefore ,Relative molecular wt. of copper=atomic wt of copper=64g

Applying mole concept:

64 g of copper contains ions = Avogadros number=6*1023

1g of copper contains ions= (6*1023)/64

6g of copper contains ions = {(6*1023)*6g}/64

=0.5625*1023