Question

Use the equation and the table to answer the question.

FeCl3 + 3H2O → Fe(OH)3 + 3HCl

Atomic Masses of Elements
Element Mass of an Atom (amu)
Fe 56
Cl 35
H 1
O 16
Iron chloride and water react according to the equation shown. The table shows the atomic masses of the elements involved in the reaction. What is the total mass of the reactants?

(1 point)
Responses

108 amu
108 amu

179 amu
179 amu

161 amu
161 amu

215 amu

Answer 1

To calculate the total mass of the reactants in the reaction:

FeCl3 + 3H2O → Fe(OH)3 + 3HCl

we need to find the mass of each reactant.

1. **For FeCl3 (Iron(III) chloride)**:
- Iron (Fe): 1 atom × 56 amu = 56 amu
- Chlorine (Cl): 3 atoms × 35 amu = 3 × 35 = 105 amu
- Total mass of FeCl3 = 56 amu + 105 amu = **161 amu**

2. **For 3H2O (Water)**:
- Hydrogen (H): 2 atoms × 1 amu × 3 molecules = 6 amu
- Oxygen (O): 1 atom × 16 amu × 3 molecules = 3 × 16 = 48 amu
- Total mass of 3H2O = 6 amu + 48 amu = **54 amu**

Now, we add the mass of both reactants:

- Total mass of reactants = Mass of FeCl3 + Mass of 3H2O
- Total mass of reactants = 161 amu + 54 amu = **215 amu**

Therefore, the total mass of the reactants is **215 amu**.