# If the atomic weight of nitrogen is 14.0, what is the mass of one mole of nitrogen gas N_2?

The mass of one mole (molar mass) of nitrogen gas $\left(\text{N"_2}\right)$ is $\text{28.0 g/mol}$.
The molar mass of an element is its relative atomic mass (atomic weight) on the periodic table in g/mol. The molar mass of the element nitrogen is $\text{14.0 g/mol}$. In order to determine the molar mass of nitrogen gas $\left(\text{N"_2}\right)$, multiply the molar mass of the element nitrogen times two.
Molar mass of nitrogen gas $\left(\text{N"_2}\right)$$= 14.0 \text{g/mol} \times 2$$=$$28.0 \text{g/mol}$