Use the equation and the table to answer the question.
FeCly + 3H20 -> Fe(OH)3 + 3HCl
Element Mass of an Atom (amu)
Fe
H
56
35
1
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)
O 108 amu
• 179 amu
O 215 amu
• 161 amu
To find the total mass of the reactants, we need to add up the atomic masses of all the elements on the left side of the equation (the reactant side).
Fe: 1 atom x 56 amu = 56 amu
Cl: 1 atom x 35 amu = 35 amu
H: 3 atoms x 1 amu = 3 amu
O: 3 atoms x 16 amu = 48 amu
Total mass of reactants = 56 amu + 35 amu + 3 amu + 48 amu = 142 amu
Therefore, the total mass of the reactants is 142 amu, so the correct answer is "161 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)
O 76 amu
O 152 amu
О 38 amu
О 228 аmu
In a chemical reaction, the total mass before the reaction is equal to the total mass after the reaction.
Let's assume the mass of the molecule formed after the reaction is x amu.
Total mass before reaction: 76 amu
Total mass after reaction: x amu
According to the law of conservation of mass, we have:
Total mass before reaction = Total mass after reaction
76 amu = x amu
Therefore, the mass of the molecule formed is 76 amu.
So, the correct answer is "76 amu".
Your answers were wrong
I apologize for the incorrect answers earlier. Let's try solving the problem again:
In a chemical reaction, the total mass before the reaction is equal to the total mass after the reaction.
Let's assume the mass of the molecule formed after the reaction is x amu.
Total mass before reaction: 76 amu
Total mass after reaction: x amu
According to the law of conservation of mass, we have:
Total mass before reaction = Total mass after reaction
76 amu = x amu
Therefore, the mass of the molecule formed is 76 amu.
So, the correct answer is "76 amu".
To find the total mass of the reactants, we need to calculate the sum of the atomic masses of all the atoms involved in the reaction.
According to the equation, the reactants are FeClₓ and H₂O, where x represents the number of Cl atoms.
The atomic mass of Fe is 56 amu, and the atomic mass of H is 1 amu. The atomic mass of Cl is not given in the table, but we can find it by subtracting the total mass of Fe from the mass of FeClₓ. From the equation, we can see that there are three Cl atoms in FeClₓ and one Fe atom, so the mass of Cl is 56 - 35 = 21 amu.
The atomic mass of O is 16 amu.
The total mass of FeClₓ is then 56 + 21x amu.
The total mass of H₂O is 3 * (2 + 16) = 54 amu.
To find the total mass of the reactants, we add up the masses of FeClₓ and H₂O: 56 + 21x + 54.
Since the equation does not specify the value of x, we cannot determine the exact mass of the reactants. Therefore, we cannot choose any of the given options.
To determine the total mass of the reactants, we need to find the molar mass of each reactant and then add them together.
Looking at the equation and the table, we see that the reactants are FeCl₃ and H₂O.
1. FeCl₃:
The atomic mass of Fe is 56 amu, and the atomic mass of Cl is 35 amu. Since there are three Cl atoms in FeCl₃, we multiply the atomic mass of Cl by 3:
35 amu x 3 = 105 amu
To find the total mass of FeCl₃, we add the atomic mass of Fe and the calculated mass of Cl:
56 amu + 105 amu = 161 amu
2. H₂O:
The atomic mass of H is 1 amu, and the atomic mass of O is 16 amu. Since there are 3 H atoms and 1 O atom in H₂O, we multiply the atomic mass of H by 3 and the atomic mass of O by 1:
1 amu x 3 = 3 amu (mass of H)
16 amu x 1 = 16 amu (mass of O)
To find the total mass of H₂O, we add the calculated masses of H and O:
3 amu + 16 amu = 19 amu
Finally, to determine the total mass of the reactants, we add the masses of FeCl₃ and H₂O:
161 amu + 19 amu = 180 amu
Therefore, the total mass of the reactants is 180 amu.
So, the correct option is:
• 180 amu