An alloy of `Cu, Ag` and `Au` is found to have copper constituting the `c.c.p.` lattice. If `Ag` atom occupy the edge centres and `Au` atom is present at body centre, the formula of this alloy is `:`

Answer

`Cu_(4)Ag_(3)Au`

Explanation

In ccp arrangement, Cu atoms occupy the corners and face centres.
`therefore` Number of Cu atoms = `8xx1//8+6xx1//2=4`
Number of silver atoms = Number of edge centres `xx1//4`
`=12xx1//4=3`
Number of gold atoms = 1(at the body centre)
Formula of alloy `=Cu_(4)Ag_(3)Au`.