1. Determine the formula:

* Ethylene glycol has the formula HOCH₂CH₂OH.

2. Count the hydrogen atoms per molecule:

* There are 6 hydrogen atoms in one molecule of ethylene glycol.

3. Calculate the total hydrogen atoms:

* Since there are 6 molecules, multiply the number of hydrogen atoms per molecule by 6: 6 hydrogen atoms/molecule * 6 molecules = 36 hydrogen atoms

Therefore, there are 36 hydrogen atoms in six molecules of ethylene glycol.