To calculate the atomic mass of Fe(OH)₃, we need to consider the contributions from each element in the formula.
- Iron (Fe): 1 atom × 56 amu = 56 amu
- Oxygen (O): 3 atoms × 16 amu = 48 amu (since there are 3 hydroxide groups, each containing 1 oxygen)
- Hydrogen (H): 3 atoms × 1 amu = 3 amu (since there are 3 hydroxide groups, each containing 1 hydrogen)
Now, we add these together:
\[ \text{Total Atomic Mass} = 56 \text{ amu (Fe)} + 48 \text{ amu (O)} + 3 \text{ amu (H)} = 107 \text{ amu} \]
So, the atomic mass of Fe(OH)₃ is 107 amu.