The formula \(5H_2O\) represents 5 molecules of water. Each molecule of water (\(H_2O\)) contains 2 atoms of hydrogen.
To find the total number of hydrogen atoms in \(5H_2O\):
\[ \text{Total hydrogen atoms} = 5 \text{ molecules} \times 2 \text{ hydrogen atoms/molecule} = 10 \text{ hydrogen atoms} \]
So, the correct answer is 10.