How many hydrogen atoms are present in 5 molecules of water (H_2O)?

• A. 10
• B. 2
• C. 5
• D. 12

Answer: (A)

Verified step by step guidance

1. Identify the chemical formula of water, which is \(\mathrm{H_2O}\). This means each water molecule contains 2 hydrogen atoms and 1 oxygen atom.
2. Determine the number of hydrogen atoms per molecule. Since the formula is \(\mathrm{H_2O}\), there are 2 hydrogen atoms in each molecule.
3. Multiply the number of hydrogen atoms per molecule by the total number of molecules given. Here, multiply 2 hydrogen atoms by 5 molecules.
4. Set up the calculation as: \$2 \times 5$ to find the total number of hydrogen atoms in 5 water molecules.
5. Perform the multiplication to find the total hydrogen atoms, which will give you the final answer.