A compound alloy of gold and copper crystallizes in a cubic lattice in which the gold atoms occupy the lattice points at the corners of a cube and the copper atoms occupy the centres of each of the cube faces. What is the empirical formula of this compound?
Gold(Au) atoms are at the corners of the cube, thus the number of Au atoms atom
Again, copper(Cu) atoms are at the face-centers of 6 faces. Therefore, the number of Cu atoms atoms.
Thus, in this case, the empirical and molecular formulae both are same.
Therefore, ?Option(4) is correct