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Molar Mass, Molecular Weight and Elemental Composition Calculator


Molar mass of Na2Cr2O7 is 261.9675 g/mol Copy to clipboard
Convert between Na2Cr2O7 weight and moles
CompoundMolesWeight, g
Na2Cr2O7Copy to clipboardCopy to clipboard

Elemental composition of Na2Cr2O7
ElementSymbolAtomic weightAtomsMass percent
SodiumNa22.98976928217.5516
ChromiumCr51.9961239.6966
OxygenO15.9994742.7518

Mass percent compositionAtomic percent composition

Sample reactions for Na2Cr2O7
EquationReaction type
Na2Cr2O7 + AlPO4 = Na3PO4 + Al2(Cr2O7)3double replacement
Na2Cr2O7 + S = Na2SO4 + Cr2O3double replacement
Mg(NO3)2 + Na2Cr2O7 = MgCr2O7 + NaNO3double replacement
Pb(NO3)2 + Na2Cr2O7 = PbCr2O7 + NaNO3double replacement
Na2Cr2O7 + Cu(NO3)2 = NaNO3 + CuCr2O7double replacement

Formula in Hill system is Cr2Na2O7

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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