To calculate the atomic mass of Fe(OH)₃, we need to sum the atomic masses of the constituent elements present in the compound.
- Iron (Fe): 1 atom × 56 amu = 56 amu
- Oxygen (O): 3 atoms × 16 amu = 48 amu (since there are 3 OH groups)
- Hydrogen (H): 3 atoms × 1 amu = 3 amu (since there are 3 OH groups)
Now, we can add these together:
\[ \text{Total atomic mass of Fe(OH)₃} = 56, \text{amu} + 48, \text{amu} + 3, \text{amu} = 107, \text{amu} \]
Thus, the atomic mass of Fe(OH)₃ is 107 amu.