mathematical representations quick check
how does the formation of water from hydrogen and oxygen demonstrate the conservation of mass? (1 point)
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 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 molecules as the reactants

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# Brief Explanations:
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. In the formation of water ($H_2O$) from hydrogen ($H_2$) and oxygen ($O_2$), we look at the atomic mass and the number of atoms. The atomic mass of the reactants (sum of masses of $H_2$ and $O_2$) equals the atomic mass of the product ($H_2O$). Also, when we balance the chemical equation $2H_2 + O_2
ightarrow2H_2O$, we count the number of atoms. For hydrogen: $2\times2 = 4$ atoms in reactants ($2H_2$) and $2\times2= 4$ atoms in products ($2H_2O$). For oxygen: $2$ atoms in reactants ($O_2$) and $2$ atoms in products ($2H_2O$). The number of molecules changes (from $3$ molecules of reactants ($2H_2 + O_2$) to $2$ molecules of $H_2O$ product), so we focus on atomic mass and number of atoms.

# Answer:
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.

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