Question

What is the mass in kilograms of 1.20x10^28 atoms of copper, Cu?

Answer 1

Answer: Mass of 1 atom of Cu=63.546 A.M.U

=63.546×1.66×10^(-27) kg

= 105.48636×10^(-27) kg

So,

Mass of 1.2×1038 atoms of Cu

= 1.2×1028×105.48636×10^(-27) kg

= 130127.973696×10^(-27) kg ANS !!!!