H2O
Enter a chemical formula to calculate its molar mass and elemental composition:
Molar mass of H2O is 18.01528 ± 0.00044 g/mol

Compound name is water
Convert between H2O weight and moles
CompoundMolesWeight, g

Elemental composition of H2OElementSymbolAtomic weightAtomsMass percent
HydrogenH1.00794211.1898
OxygenO15.9994188.8102
Mass percent compositionAtomic percent composition

Sample reactions for H2O
EquationReaction type
Na + H2O = NaOH + H2single replacement
CO2 + H2O = C6H12O6 + O2double replacement
P4O10 + H2O = H3PO4synthesis
K + H2O = KOH + H2single replacement
Fe + H2O = Fe3O4 + H2single replacement
Formula in Hill system is H2O

Computing molar mass (molar weight)

To calculate molar mass of a chemical compound enter its formula and click "Compute". In chemical formula you may use:Any chemical element. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmgparantesis () or brackets <>.Common compound names.Examples of molar mass computations: NaCl, Ca(OH)2, K4,CuSO4*5H2O,water,nitric acid,potassium permanganate,ethanol,fructose.

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Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.

Computing molecular weight (molecular mass)

To calculate molecular weight of a chemical compound enter it"s formula, specify its isotope mass number after each element in square brackets.Examples of molecular weight computations: C<14>O<16>2, S<34>O<16>2.

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Definitions of molecular mass, molecular weight, molar mass and molar weight

Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12) Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.Weights of atoms and isotopes are from NIST article.Related: Molecular weights of amino acidsmolecular weights calculated today Please let us know how we can improve this web app.
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