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Molar Mass, Molecular Weight and Elemental Composition Calculator


Molar mass of NH4NO3 is 80.0434 g/mol Copy to clipboard
Compound name is ammonium nitrate

Convert between NH4NO3 weight and moles
CompoundMolesWeight, g
NH4NO3Copy to clipboardCopy to clipboard

Elemental composition of NH4NO3
ElementSymbolAtomic weightAtomsMass percent
NitrogenN14.0067234.9978
HydrogenH1.0079445.0370
OxygenO15.9994359.9652

Mass percent compositionAtomic percent composition

Sample reactions for NH4NO3
EquationReaction type
NH4NO3 = N2O + H2Odecomposition
NH4NO3 = N2 + O2 + H2Odecomposition
Li3N + NH4NO3 = LiNO3 + (NH4)3Ndouble replacement
MgCl2 + NH4NO3 = Mg(NO3)2 + NH4Cldouble replacement
NaOH + NH4NO3 = NaNO3 + NH4OHdouble replacement

Formula in Hill system is H4N2O3

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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