Use the equation and the table to answer the 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
215 amu
215 amu
179 amu
179 amu
161 amu
161 amu
108 amu
To find the total mass of the reactants, we need to calculate the molar mass of each reactant and then multiply by the stoichiometric coefficients in the balanced equation.
The molar mass of FeCl3 is (56 amu/mol) + (3 * 35 amu/mol) = 167 amu/mol.
The molar mass of H2O is (2 * 1 amu/mol) + (16 amu/mol) = 18 amu/mol.
Using the stoichiometric coefficients from the balanced equation, we have:
3 moles of FeCl3 + 3 moles of H2O
Therefore, the total mass of the reactants is:
(3 mol * 167 amu/mol) + (3 mol * 18 amu/mol) = 501 amu + 54 amu = 555 amu.
So, the correct answer is 555 amu.
To find the total mass of the reactants, we need to calculate the mass of each element and multiply it by the corresponding coefficient in the equation.
FeCl3 has a molecular mass of (1 x Fe) + (3 x Cl) = (1 x 56) + (3 x 35) = 161 amu.
H2O has a molecular mass of (2 x H) + (1 x O) = (2 x 1) + (1 x 16) = 18 amu.
Now, we can add the mass of FeCl3 and H2O to get the total mass of the reactants:
161 amu + 18 amu = 179 amu.
Therefore, the correct answer is:
179 amu
To find the total mass of the reactants, we need to add up the masses of all the atoms present on the left side of the equation (the reactants).
The reactants are FeCl3 and H2O. The molar mass of FeCl3 can be found by multiplying the atomic mass of Fe (56 amu) by 1 (since there is one Fe atom), and multiplying the atomic mass of Cl (35 amu) by 3 (since there are three Cl atoms).
Molar mass of FeCl3 = (56 amu * 1) + (35 amu * 3)
= 56 amu + 105 amu
= 161 amu
The molar mass of H2O can be found by multiplying the atomic mass of H (1 amu) by 2 (since there are two H atoms), and adding the atomic mass of O (16 amu).
Molar mass of H2O = (1 amu * 2) + 16 amu
= 2 amu + 16 amu
= 18 amu
Now, we can find the total mass of the reactants by adding the molar masses of FeCl3 and H2O.
Total mass of reactants = Molar mass of FeCl3 + Molar mass of H2O
= 161 amu + 18 amu
= 179 amu
Therefore, the total mass of the reactants is 179 amu.