Which one of the following contains the most moles of hydrogen atoms?

• A. 1 mol of CH4
• B. 1 mol of H2SO4
• C. 1 mol of H2O
• D. 1 mol of NH3

Answer: (A)

Verified step by step guidance

1. Identify the number of hydrogen atoms in one molecule of each compound: CH4, H2SO4, H2O, and NH3.
2. For CH4 (methane), count the hydrogen atoms: there are 4 hydrogen atoms per molecule.
3. For H2SO4 (sulfuric acid), count the hydrogen atoms: there are 2 hydrogen atoms per molecule.
4. For H2O (water), count the hydrogen atoms: there are 2 hydrogen atoms per molecule.
5. For NH3 (ammonia), count the hydrogen atoms: there are 3 hydrogen atoms per molecule.
6. Since 1 mole of any substance contains Avogadro's number of molecules, multiply the number of hydrogen atoms per molecule by 1 mole (Avogadro's number) to find the total moles of hydrogen atoms in each case.
7. Compare the total moles of hydrogen atoms for each compound to determine which contains the most.