Answer:
an exothermic reaction that Increase in entropy
Generally, the top elements in group 16 will have a charge of -2, although the entire group isn't standardized.
Avegadro's number = 6.02 x10^23 atoms
so
3.5g x 1mol/63.55g Cu x 6.02 x 10^23/ 1mol=3.32 x 10^22 atoms
