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 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.

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.

Answer 1

The first option. Balanced equation: 2H2 + O2 → 2H2O. Reactants: 4 H atoms + 2 O atoms = 6 atoms total; Products: 4 H + 2 O = 6 atoms total. The total mass (sum of atomic masses) is the same before and after, demonstrating conservation of mass.