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Molar Mass, Molecular Weight and Elemental Composition Calculator


Molar mass of N2O4 is 92.0110 g/mol Copy to clipboard
Compound name is dinitrogen tetroxide

Convert between N2O4 weight and moles
CompoundMolesWeight, g
N2O4Copy to clipboardCopy to clipboard

Elemental composition of N2O4
ElementSymbolAtomic weightAtomsMass percent
NitrogenN14.0067230.4457
OxygenO15.9994469.5543

Mass percent compositionAtomic percent composition

Sample reactions for N2O4
EquationReaction type
N2H4 + N2O4 = N2 + H2Odouble replacement
N2O4 + N2H4 = N + H2Odouble replacement
N2O4 + H2O = HNO3 + NOdouble replacement
N2H2 + N2O4 = N2 + H2Odouble replacement
N2O4 = N2 + O2decomposition

Formula in Hill system is N2O4

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, Dmg
  • parantesis () or brackets [].
  • Common compound names.
Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, water, nitric acid, potassium permanganate, ethanol, fructose.

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.

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.

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Related: Molecular weights of amino acids
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