Nitrogen gas is a diatomic molecule. What is the molar mass of one mole of nitrogen gas (N_2)?

• A. 14.01 g/mol
• B. 2.00 g/mol
• C. 28.02 g/mol
• D. 32.00 g/mol

Answer: (C)

Verified step by step guidance

1. Identify the atomic mass of a single nitrogen (N) atom from the periodic table, which is approximately 14.01 g/mol.
2. Recognize that nitrogen gas (N_2) is diatomic, meaning each molecule consists of two nitrogen atoms.
3. Calculate the molar mass of nitrogen gas by multiplying the atomic mass of nitrogen by 2: \(\text{Molar mass of } N_2 = 2 \times 14.01 \text{ g/mol}\).
4. Express the molar mass of nitrogen gas as the sum of the masses of the two nitrogen atoms in one mole of N_2 molecules.
5. Conclude that the molar mass of nitrogen gas is approximately 28.02 g/mol, which corresponds to the combined mass of two nitrogen atoms.