Sodium arsenite (NaAsO2) is an inorganic compound of three elements: Sodium, Arsenic, and Oxygen. The molecular weight of Sodium arsenite is 129.91016428 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.
![Sodium Arsenite [NaAsO2] Molecular Weight Calculation](https://www.laboratorynotes.com/wp-content/uploads/2023/05/fi-sodium-arsenite-molecular-weight-calculation-100x100.jpg "Sodium Arsenite [NaAsO2] Molecular Weight Calculation")