Determine the molar mass of sodium hydroxide.

The molar mass of sodium hydroxide (NaOH) is calculated by adding the atomic masses of sodium (Na), oxygen (O), and hydrogen (H) present in one molecule of NaOH.

The atomic masses are as follows:
- Sodium (Na) = 22.99 g/mol
- Oxygen (O) = 16.00 g/mol
- Hydrogen (H) = 1.01 g/mol

Therefore, the molar mass of sodium hydroxide (NaOH) = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol
= 40.00 g/mol

So, the molar mass of sodium hydroxide is 40.00 g/mol.