Final answer:
The molecule has three chemically equivalent hydrogens.
Step-by-step explanation:
In the given molecule, there are three hydrogens bonded to the central oxygen atom. Additionally, the oxygen atom has two lone pairs. To determine the number of chemically non-equivalent hydrogens, we need to consider the arrangement of atoms and lone pairs. In this case, the molecule has a tetrahedral shape. Each hydrogen atom and the lone pair occupy the corners of the tetrahedron, which means that all three hydrogens are chemically equivalent.