To find the total mass of the reactants, we need to calculate the mass of each individual reactant and then add them together.
For FeCl3, we have 1 atom of Fe (56 amu) and 3 atoms of Cl (35 amu each), so the mass of FeCl3 is 56 amu + (3 x 35 amu) = 56 amu + 105 amu = 161 amu.
For H2O, we have 2 atoms of H (1 amu each) and 1 atom of O (16 amu), so the mass of H2O is (2 x 1 amu) + 16 amu = 2 amu + 16 amu = 18 amu.
Therefore, the total mass of the reactants is 161 amu + 18 amu = 179 amu.
So the correct answer is 179 amu.
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?
215 amu
108amu
161 amu
179 amu
1 answer