Molar mass of water (H2O)

The molar mass of water (H2O) is 18.015 g/mol.

dihydrogen monoxide

Step-by-step calculation

Element	Atoms	Atomic mass	Subtotal
Hydrogen	× 2	1.008	= 2.016
Oxygen	× 1	15.999	= 15.999
Total			18.015 g/mol

Water is a colorless, odorless, and nearly tasteless liquid at room temperature, made of two hydrogen atoms bonded to one oxygen atom.
It covers about 71 percent of Earth's surface and makes up roughly 60 percent of an adult human body by mass.
Unlike most substances, water is less dense as a solid than as a liquid, which is why ice floats on lakes and oceans.

H₂O NaCl CO₂ C₆H₁₂O₆ H₂SO₄ Ca(OH)₂ CuSO₄·5H₂O C₈H₁₀N₄O₂

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NaOH Sodium hydroxide H₂SO₄ Sulfuric acid NaHCO₃ Sodium bicarbonate KOH Potassium hydroxide C₂H₅OH Ethanol CH₃COOH Acetic acid

What is the molar mass of H2O?

The molar mass of water (H2O) is 18.015 g/mol.

How do you calculate the molar mass of H2O?

Multiply the atomic mass of each element by the number of its atoms in H2O, then add the results: 2 × 1.008 (H) + 1 × 15.999 (O) = 18.015 g/mol.

What percentage of H2O is Oxygen?

Oxygen makes up 88.81% of the mass of water (H2O).