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
108 amu
108 amu
215 amu
215 amu
161 amu
161 amu
179 amu
To find the total mass of the reactants, we need to calculate the mass of each reactant and then add them together.
For FeCl3 (iron chloride), we have 1 iron atom (Fe) with a mass of 56 amu and 3 chlorine atoms (Cl) with a mass of 35 amu each. So the mass of FeCl3 is:
(1 atom Fe x 56 amu) + (3 atoms Cl x 35 amu) = 56 amu + 105 amu = 161 amu
For H2O (water), we have 2 hydrogen atoms (H) with a mass of 1 amu each and 1 oxygen atom (O) with a mass of 16 amu. So the mass of H2O is:
(2 atoms H x 1 amu) + (1 atom O x 16 amu) = 2 amu + 16 amu = 18 amu
Adding the mass of FeCl3 and H2O together:
161 amu + 18 amu = 179 amu
Therefore, the total mass of the reactants is 179 amu.
In a chemical reaction, two molecules with a total mass of 76 amu react to form a single molecule. What is the mass of the molecule that is formed?(1 point)
Responses
228 amu
228 amu
152 amu
152 amu
38 amu
38 amu
76 amu
76 amu
In this chemical reaction, the total mass of the reactants is 76 amu. The reaction forms a single molecule. Since the total mass of the reactants is equal to the mass of the final molecule, the mass of the molecule that is formed is also 76 amu. Therefore, the correct answer is 76 amu.
To find the total mass of the reactants, we need to calculate the mass of each element and then add them together.
FeCl3:
- Atomic mass of Fe = 56 amu
- Atomic mass of Cl = 35 amu
- There are 3 Cl atoms in FeCl3, so the total mass of Cl = 3 x 35 amu = 105 amu
H2O:
- Atomic mass of H = 1 amu
- Atomic mass of O = 16 amu
- There are 2 H atoms and 1 O atom in H2O, so the total mass of H2O = 2 x 1 amu + 1 x 16 amu = 18 amu
Total mass of the reactants = mass of FeCl3 + mass of H2O
= 56 amu + 105 amu + 18 amu
= 179 amu
Therefore, the correct answer is 179 amu.
To find the total mass of the reactants, we need to calculate the individual masses of each reactant and then add them together.
First, let's calculate the mass of FeCl3:
Fe = 56 amu
Cl = 35 amu (there are three Cl atoms)
Total mass of FeCl3 = (56 amu) + (35 amu * 3) = 161 amu
Next, let's calculate the mass of H2O:
H = 1 amu (there are six H atoms)
O = 16 amu (there are three O atoms)
Total mass of H2O = (1 amu * 6) + (16 amu * 3) = 108 amu
Finally, let's add the masses of FeCl3 and H2O to get the total mass of the reactants:
Total mass of reactants = 161 amu + 108 amu = 269 amu
Therefore, the correct answer is 269 amu.