* Ethanal's Formula: The chemical formula for ethanal is CH₃CHO.
* Counting Hydrogens:
* The first part of the formula (CH₃) represents a methyl group, which has 3 hydrogen atoms.
* The second part (CHO) represents a formyl group, which has 1 hydrogen atom.
* Total: 3 hydrogen atoms + 1 hydrogen atom = 4 hydrogen atoms
Therefore, there are 4 hydrogen atoms in an ethanal molecule.
