what is the mass of 1/2 avogadros number of copper atoms and how do u work it out??

Answer 1

Avogadro's number is the number of items in one mole of that item. ½ of Avogadro's number means ½ of a mole.

½ of a mole means to take the atomic weight of copper, and divide by 2 . . .

Can you get it by yourself from here?

Answer 2

Avogadro's number is the number of atoms in a gram-mole of a material. The atomic weight of copper is 63.546, which means a mole (Avogadro's number of atoms) would weigh 63.546 grams. So half Avogadro's number of atoms would weigh half that.