In the chemical formula \(6H_2O\):
- The coefficient (6) represents the number of water molecules.
- The subscript (2) next to hydrogen (H) indicates that there are 2 hydrogen atoms in each water molecule.
The water molecule (H2O) consists of 2 hydrogen atoms and 1 oxygen atom. However, in the context of the overall formula, we acknowledge that the subscript for oxygen is implicit (1).
So, the correct interpretation of \(6H_2O\) is:
a. Coefficient represents the number of water molecules, subscript represents the number of hydrogen atoms.