Use the equation and the table to answer the question.

Question

FeCl3 + 3H2O → Fe(OH)3 + 3HCl

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

161 amu
161 amu

108 amu
108 amu

215 amu
215 amu

179 amu..

Answer 1

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

$${\text{FeCl}}_3+3{\text{H}}_2\text{O}$$

we need to find the mass of each component in the reactants.

1. Mass of FeCl3:

   • Iron (Fe): 56 amu
   • Chlorine (Cl): 35 amu, and there are 3 chlorine atoms. $$\text{Mass of }{\text{FeCl}}_3=56+(3\times 35)=56+105=161\text{ amu}$$

2. Mass of 3H2O:

   • Hydrogen (H): 1 amu, and there are 2 hydrogen atoms for each water molecule. So for 3H2O: $$\text{Mass of }{\text{H}}_2\text{O}=(2\times 1)+16=2+16=18\text{ amu}$$ Therefore, for 3 water molecules: $$\text{Mass of }3{\text{H}}_2\text{O}=3\times 18=54\text{ amu}$$

3. Total Mass of the Reactants: $$\text{Total mass}=\text{Mass of }{\text{FeCl}}_3+\text{Mass of }3{\text{H}}_2\text{O}$$ $$\text{Total mass}=161+54=215\text{ amu}$$

Thus, the total mass of the reactants is 215 amu.