1. Identify the elements and their atomic masses:

* Nitrogen (N): 14.01 g/mol

* Oxygen (O): 16.00 g/mol

2. Determine the number of each element in the formula:

* Nitrogen (N): 1 atom

* Oxygen (O): 2 atoms

3. Calculate the molar mass:

* (1 N atom * 14.01 g/mol/N atom) + (2 O atoms * 16.00 g/mol/O atom) = 46.01 g/mol

Therefore, the molar mass of NO2 is 46.01 g/mol.