Acetic acid formula?

What is the chemical formula of acetic acid?

Acetic acid’s chemical formula is CH3COOH (which is also commonly written as C2H4O2). [1]

How is acetic acid’s formula structured?

• CH3COOH shows acetic acid has a methyl group (CH3–) attached to a carboxylic acid group (–COOH).
  
• Counting atoms from CH3COOH gives C2H4O2.
  
  

Is there another common notation for the same formula?

Yes. Different notations are used to emphasize different aspects:
- Molecular (condensed) formula: CH3COOH
- Molecular (counted) formula: C2H4O2

Sources
[1] https://pubchem.ncbi.nlm.nih.gov/compound/Acetic-Acid