How many moles of hydrogen atoms are present in 2.0 moles of ammonia (NH_3)?

• A. 3.0 moles
• B. 2.0 moles
• C. 6.0 moles
• D. 1.0 mole

Answer: (C)

Verified step by step guidance

1. Identify the chemical formula of ammonia, which is \(\mathrm{NH_3}\). This means each molecule of ammonia contains 1 nitrogen atom and 3 hydrogen atoms.
2. Understand that the problem asks for the number of moles of hydrogen atoms in 2.0 moles of ammonia molecules.
3. Use the relationship between moles of molecules and moles of atoms: multiply the moles of ammonia by the number of hydrogen atoms per molecule. Mathematically, this is \(\text{moles of H atoms} = \text{moles of } \mathrm{NH_3} \times 3\).
4. Substitute the given value: \(\text{moles of H atoms} = 2.0 \text{ moles } \times 3\).
5. This calculation will give the total moles of hydrogen atoms present in 2.0 moles of ammonia.