To calculate the atomic mass of Fe(OH)₃, we need to consider the contributions from one iron atom, three oxygen atoms, and three hydrogen atoms.
- Iron (Fe): 1 atom × 56 amu = 56 amu
- Oxygen (O): 3 atoms × 16 amu = 3 × 16 = 48 amu
- Hydrogen (H): 3 atoms × 1 amu = 3 × 1 = 3 amu
Now, add these masses together:
\[ \text{Total atomic mass} = \text{Fe} + \text{O} + \text{H} = 56 \text{ amu} + 48 \text{ amu} + 3 \text{ amu} = 107 \text{ amu} \]
Thus, the atomic mass of Fe(OH)₃ is 107 amu.