Question

How does the formation of water from hydrogen and oxygen demonstrate the conservation of mass?(1 point)
Responses

The atomic mass of the reactants equals the atomic mass of the product, and the product has the same number of atoms as the reactants.
The atomic mass of the reactants equals the atomic mass of the product, and the product has the same number of atoms as the reactants.

The atomic number of the reactants equals the atomic number of the product, and the product has the same number of molecules as the reactants.
The atomic number of the reactants equals the atomic number of the product, and the product has the same number of molecules as the reactants.

The atomic number of the reactants equals the atomic number of the product, and the product has the same number of atoms as the reactants.
The atomic number of the reactants equals the atomic number of the product, and the product has the same number of atoms as the reactants.

The atomic mass of the reactants equals the atomic mass of the product, and the product has the same number of molecules as the reactants.
The atomic mass of the reactants equals the atomic mass of the product, and the product has the same number of molecules as the reactants.
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Answer 1

The first option is correct:

"The atomic mass of the reactants equals the atomic mass of the product, and the product has the same number of atoms as the reactants."

Explanation: In 2H2 + O2 → 2H2O the number of H and O atoms is the same before and after the reaction (4 H and 2 O), so total mass is conserved.