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Molar Mass, Molecular Weight and Elemental Composition Calculator


Molar mass of C9H8O4 is 180.1574 g/mol Copy to clipboard
Compound name is aspirin

Convert between C9H8O4 weight and moles
CompoundMolesWeight, g
C9H8O4Copy to clipboardCopy to clipboard

Elemental composition of C9H8O4
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.0107960.0010
HydrogenH1.0079484.4758
OxygenO15.9994435.5232

Mass percent compositionAtomic percent composition

Sample reactions for C9H8O4
EquationReaction type
C9H8O4 + O2 = CO2 + H2Ocombustion
C9H8O4 + NaOH = C9H7O4Na + H2Odouble replacement
C9H8O4 + NaOH = NaC9H7O4 + H2Odouble replacement
C9H8O4 + NaOH = NaC8H7O4 + H2Odouble replacement
C9H8O4 = C7H6O3 + C2H4O2decomposition

Formula in Hill system is C9H8O4

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.

Give us feedback about your experience with Molecular Weight Calculator.

Related: Molecular weights of amino acids
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