What is the molar mass of molecular hydrogen (H_2)?

• A. 1.01 g/mol
• B. 2.02 g/mol
• C. 16.00 g/mol
• D. 18.02 g/mol

Answer: (B)

Verified step by step guidance

1. Identify the molecular formula of molecular hydrogen, which is \(\mathrm{H_2}\), meaning it consists of two hydrogen atoms bonded together.
2. Recall the atomic mass of a single hydrogen atom, which is approximately 1.01 g/mol.
3. Calculate the molar mass of \(\mathrm{H_2}\) by multiplying the atomic mass of hydrogen by 2, since there are two hydrogen atoms in the molecule.
4. Express the calculation as: \(\text{Molar mass of } \mathrm{H_2} = 2 \times 1.01\ \mathrm{g/mol}\).
5. Sum the values to find the total molar mass of molecular hydrogen, which will be approximately 2.02 g/mol.