The formula NaHCO4 is incorrect. The correct formula for sodium bicarbonate is NaHCO3.

Here's how to figure out the number of atoms in a molecule:

* Na: There's one sodium atom (Na).

* H: There's one hydrogen atom (H).

* C: There's one carbon atom (C).

* O: There are three oxygen atoms (O).

In total, NaHCO3 has 6 atoms.