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