In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?
A. Zn + 2HCI → H2 + ZnCI2
B. CO2 + H2O + CH2OH + O2
C. Li2CO3 + LiO + CO2
D. CH4 + O2 + 2H2O
D. CH4 + O2 + 2H2O
Which statement is true regarding a chemical reaction?
A. Even if the total number of atoms does not change, mass may not be conserved in the reaction.
B. The total number of atoms does not change, so mass is conserved in the reaction.
C. The total number of atoms changes, so mass is conserved in the reaction.
D. Even if the total number of atoms changes, mass may not be conserved in the reaction.
B. The total number of atoms does not change, so mass is conserved in the reaction.
Use the equation and the table to answer the question.
FeCl3 + 3H2O → Fe(OH)3 + 3HCl
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. 161 amu
B. 179 amu
C. 215 amu
D. 108 amu
To find the total mass of the reactants, we need to calculate the sum of the atomic masses of the elements in the reactants.
FeCl3: (1 x atomic mass of Fe) + (3 x atomic mass of Cl) = (1 x 55.85) + (3 x 35.45) = 166.35 amu
3H2O: (3 x atomic mass of H) + (2 x atomic mass of O) = (3 x 1.01) + (2 x 16.00) = 55.03 amu
The total mass of the reactants is the sum of these two values:
166.35 amu + 55.03 amu = 221.38 amu
Therefore, the total mass of the reactants is 221.38 amu.
None of the given options match this sum, so none of the options are correct.
which one is correct?
My apologies for the mistake in my previous response. Let's calculate the correct total mass of the reactants.
FeCl3: (1 x atomic mass of Fe) + (3 x atomic mass of Cl) = (1 x 55.85) + (3 x 35.45) = 162.2 amu
3H2O: (3 x atomic mass of H) + (6 x atomic mass of O) = (3 x 1.01) + (6 x 16.00) = 97.18 amu
The total mass of the reactants is the sum of these two values:
162.2 amu + 97.18 amu = 259.38 amu
Therefore, the correct answer is not provided in the options given. I apologize for the confusion.
out of all of the options which one is the correct one
Apologies for the confusion caused. Based on the options provided, the closest answer would be C. 215 amu. Although it is not the exact sum, it is the closest option to the calculated total mass of the reactants, which is 259.38 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?
A. 228 amu
B. 152 amu
C. 38 amu
D. 76 amu