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To find the total mass of the reactants, we need to sum the individual masses of the atoms involved in the reaction.
FeCl3:
Fe (Iron) has a mass of 56 amu
Cl (Chlorine) has a mass of 35 amu (x3 because there are three chlorine atoms in FeCl3)
Total mass of FeCl3 = 56 amu + (35 amu * 3) = 56 amu + 105 amu = 161 amu
H2O:
H (Hydrogen) has a mass of 1 amu (x6 because there are six hydrogen atoms in 3H2O)
O (Oxygen) has a mass of 16 amu (x3 because there are three oxygen atoms in 3H2O)
Total mass of H2O = (1 amu * 6) + (16 amu * 3) = 6 amu + 48 amu = 54 amu
Therefore, the total mass of the reactants is 161 amu (FeCl3) + 54 amu (H2O) = 215 amu.
The correct answer is:
215 amu