Question

what is the molar mass of naoh? 35.997 g/mol 38.989 g/mol 39.997 g/mol 41.997 g/mol

Explanation:

Step1: Find atomic masses

Atomic mass of Na: $22.9898\ \text{g/mol}$, O: $15.9994\ \text{g/mol}$, H: $1.00794\ \text{g/mol}$.

Step2: Sum atomic masses

Molar mass of NaOH = Na + O + H = $22.9898 + 15.9994 + 1.00794$.
Calculate: $22.9898 + 15.9994 = 38.9892$; $38.9892 + 1.00794 = 39.99714\ \text{g/mol} \approx 39.997\ \text{g/mol}$.

Answer:

39.997 g/mol (corresponding to the green option: 39.997 g/mol)