What is the molar mass of H_2?

• A. 1.01 g/mol
• B. 2.02 g/mol
• C. 28.02 g/mol
• D. 18.02 g/mol

Answer: (B)

Verified step by step guidance

1. Identify the elements present in the molecule H_2. Here, H_2 consists of two hydrogen atoms bonded together.
2. Find the atomic mass of a single hydrogen atom from the periodic table. The atomic mass of hydrogen (H) is approximately 1.01 g/mol.
3. Since there are two hydrogen atoms in H_2, multiply the atomic mass of hydrogen by 2 to get the molar mass of H_2.
4. Write the calculation as: \(\text{Molar mass of } H_2 = 2 \times 1.01 \text{ g/mol}\).
5. This result gives the molar mass of H_2, which is the sum of the masses of the two hydrogen atoms.