Here's how to determine the number of atoms in potassium hydroxide (KOH):

* Identify the elements: Potassium hydroxide is composed of potassium (K), oxygen (O), and hydrogen (H).

* Count the atoms of each element:

* There is 1 potassium atom (K)

* There is 1 oxygen atom (O)

* There is 1 hydrogen atom (H)

* Total atoms: 1 + 1 + 1 = 3 atoms

Therefore, there are 3 atoms in a molecule of potassium hydroxide (KOH).