Use the equation and the table to answer the question.

Question

FeCI3 + 3H2O=Fe(OH)3+3HCI

Element Mass of an Atom (amu)
Fe 56
CI 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?

a. 179

b. 215

c. 161

d. 108

Answer 1

To find the total mass of the reactants, we need to calculate the mass of each element in the reactants and then add them together.

FeCI3:
1 iron atom (Fe) = 56 amu
3 chlorine atoms (CI) = 3 x 35 amu = 105 amu
Total mass of FeCI3 = 56 + 105 = 161 amu

3H2O:
6 hydrogen atoms (H) = 6 x 1 amu = 6 amu
3 oxygen atoms (O) = 3 x 16 amu = 48 amu
Total mass of 3H2O = 6 + 48 = 54 amu

Total mass of the reactants = 161 amu (FeCI3) + 54 amu (3H2O) = 215 amu

Therefore, the total mass of the reactants is 215 amu. Therefore, the correct answer is b. 215.