The molecular weight of hydrogen peroxide (H₂O₂) is 34.0147 g/mol.

Here's how to calculate it:

* Hydrogen (H): Atomic weight = 1.00794 g/mol

* Oxygen (O): Atomic weight = 15.9994 g/mol

Calculation:

(2 x 1.00794 g/mol) + (2 x 15.9994 g/mol) = 34.0147 g/mol