Respuesta :
Answer: subscript 3 mean 3 oxygen atoms
Explanation: NaHCO3 is an ionic compound which when dissolved in water gets dissociated into its constituent ions that are Na+ and HCO3- .
Thus the subscript 3 explains the number of oxygen that are attached to the carbon in the hydrogen carbonate ion.
The structure of the following is given below -
![Ver imagen KaptainEasy](https://us-static.z-dn.net/files/d14/23416e25cdc6e4fb5d90a3e0676305b7.png)