copper wire consists of copper atoms connected through metallic bonds. find the moles of copper in 1.87 * 1024 copper atoms.

The metal is named first

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).