The molecule that shows two atoms of hydrogen (H) is 2H2O.
This notation indicates that there are two molecules of water, and each water molecule (H2O) contains two hydrogen atoms. Therefore, in total, there are 2 x 2 = 4 hydrogen atoms in 2H2O.
However, if you are looking for just a single instance of two hydrogen atoms, then the notation itself indicates that each water molecule has exactly two hydrogen atoms. Thus, the answer is 2H2O.
If you are only looking for a formula that contains exactly two hydrogens in a single molecule, HO2 also contains two hydrogen atoms. Each molecule consists of two hydrogen atoms bonded to one oxygen atom.
To clarify:
- HO2 contains 2 H.
- H2SO4 contains 2 H.
- 2CH4 implies 8 H in total (2 x 4).
- 2H2O contains 4 H in total (2 x 2).
The options HO2 and H2SO4 both contain exactly two hydrogen atoms when considered individually.