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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
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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.
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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
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which one is correct?
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out of all of the options which one is the correct one
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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
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