Final answer:
The relative formula mass of dihydrogen monoxide (H2O) is 18.02 g/mol when considering two hydrogen atoms and one oxygen atom in each molecule.
Explanation:
The relative formula mass of dihydrogen monoxide (H2O) can be calculated by summing the atomic masses of its constituent atoms from the Periodic Table. For water, the formula mass is 18.02 g/mol, representing two hydrogen atoms and one oxygen atom in each molecule.
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