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To calculate the total mass of the reactants in the given reaction involving iron chloride (FeCl₃) and water (H₂O), we first need to identify the molecular formulas and the corresponding atomic masses from the data you've provided.
1. **Iron chloride (FeCl₃)**
- Iron (Fe): 1 atom × 56 amu = 56 amu
- Chlorine (Cl): 3 atoms × 35 amu = 105 amu
- Total mass of FeCl₃ = 56 amu + 105 amu = 161 amu
2. **Water (Hâ‚‚O)**
- Hydrogen (H): 2 atoms × 1 amu = 2 amu
- Oxygen (O): 1 atom × 16 amu = 16 amu
- Total mass of Hâ‚‚O = 2 amu + 16 amu = 18 amu
Now, to find the total mass of the reactants (FeCl₃ + H₂O), we add the two total masses together:
\[
\text{Total mass of reactants} = \text{mass of FeCl₃} + \text{mass of H₂O}
\]
\[
\text{Total mass of reactants} = 161 \text{ amu} + 18 \text{ amu} = 179 \text{ amu}
\]
So, the total mass of the reactants is **179 amu**.