Answer:
The molecular formula is Sn3(PO4)4.
Step-by-step explanation:
The molecular formulas are:
Na2SO4: Sodium sulfate
C6H5Cl: Chlorobenzene
N2O4: Dinitrogen tetroxide
Sn3(PO4)4: Tin(IV) phosphate
These are all chemical compounds represented by their molecular formulas.