Step-by-step explanation:
is a compound which consists of four moles of oxygen, phosphorus and oxygen.
Number of sodium atom in
is,

Number of phosphorus atom in
is,

Number of oxygen atom in
is,

Hence, the no of atoms of each element are as follows :
Sodium, Na = 12 atoms
Phosphorus, P = 4 atoms
Oxygen, O = 16 atoms
Hence, this is the required solution.