You're asking about the mass of one molecule of H₂S (hydrogen sulfide), not SH₂. Here's how to calculate it:

1. Determine the atomic masses:

* Hydrogen (H): 1.008 atomic mass units (amu)

* Sulfur (S): 32.065 amu

2. Calculate the molecular mass:

* H₂S has 2 hydrogen atoms and 1 sulfur atom.

* Molecular mass = (2 * 1.008 amu) + (1 * 32.065 amu) = 34.081 amu

Therefore, the mass of one molecule of H₂S is approximately 34.081 atomic mass units.