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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiUOCBNFArNaKAlSClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVYCr is 2991.7652 g/mol

Convert between HHeLiUOCBNFArNaKAlSClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVYCr weight and moles
CompoundMolesWeight, g
HHeLiUOCBNFArNaKAlSClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVYCr

Elemental composition of HHeLiUOCBNFArNaKAlSClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVYCr
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0337
HeliumHe4.00260210.1338
LithiumLi6.94110.2320
UraniumU238.0289117.9561
OxygenO15.999410.5348
CarbonC12.010710.4015
BoronB10.81110.3614
NitrogenN14.006710.4682
FluorineF18.998403210.6350
ArgonAr39.94811.3353
SodiumNa22.9897692810.7684
PotassiumK39.098311.3069
AluminumAl26.981538610.9019
SulfurS32.06511.0718
ChlorineCl35.45311.1850
NeonNe20.179710.6745
XenonXe131.29314.3885
KryptonKr83.79812.8010
RadiumRa226.02541017.5549
IodineI126.9044714.2418
ArsenicAs74.9216012.5043
AstatineAt209.98714817.0188
SeleniumSe78.9612.6392
PoloniumPo208.98243016.9853
PlatinumPt195.08416.5207
GoldAu196.96656916.5836
GalliumGa69.72312.3305
GermaniumGe72.6412.4280
MercuryHg200.5916.7047
LeadPb207.216.9257
IronFe55.84511.8666
CopperCu63.54612.1240
CobaltCo58.93319511.9698
VanadiumV50.941511.7027
YttriumY88.9058512.9717
ChromiumCr51.996111.7380

Computing molar mass step by step

First, compute the number of each atom in HHeLiUOCBNFArNaKAlSClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVYCr:
H: 1, He: 1, Li: 1, U: 1, O: 1, C: 1, B: 1, N: 1, F: 1, Ar: 1, Na: 1, K: 1, Al: 1, S: 1, Cl: 1, Ne: 1, Xe: 1, Kr: 1, Ra: 1, I: 1, As: 1, At: 1, Se: 1, Po: 1, Pt: 1, Au: 1, Ga: 1, Ge: 1, Hg: 1, Pb: 1, Fe: 1, Cu: 1, Co: 1, V: 1, Y: 1, Cr: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, U: 238.02891, O: 15.9994, C: 12.0107, B: 10.811, N: 14.0067, F: 18.9984032, Ar: 39.948, Na: 22.98976928, K: 39.0983, Al: 26.9815386, S: 32.065, Cl: 35.453, Ne: 20.1797, Xe: 131.293, Kr: 83.798, Ra: 226.0254098, I: 126.90447, As: 74.9216, At: 209.987148, Se: 78.96, Po: 208.9824304, Pt: 195.084, Au: 196.966569, Ga: 69.723, Ge: 72.64, Hg: 200.59, Pb: 207.2, Fe: 55.845, Cu: 63.546, Co: 58.933195, V: 50.9415, Y: 88.90585, Cr: 51.9961

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiUOCBNFArNaKAlSClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVYCr) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(U) * Weight(U) + Count(O) * Weight(O) + Count(C) * Weight(C) + Count(B) * Weight(B) + Count(N) * Weight(N) + Count(F) * Weight(F) + Count(Ar) * Weight(Ar) + Count(Na) * Weight(Na) + Count(K) * Weight(K) + Count(Al) * Weight(Al) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Ne) * Weight(Ne) + Count(Xe) * Weight(Xe) + Count(Kr) * Weight(Kr) + Count(Ra) * Weight(Ra) + Count(I) * Weight(I) + Count(As) * Weight(As) + Count(At) * Weight(At) + Count(Se) * Weight(Se) + Count(Po) * Weight(Po) + Count(Pt) * Weight(Pt) + Count(Au) * Weight(Au) + Count(Ga) * Weight(Ga) + Count(Ge) * Weight(Ge) + Count(Hg) * Weight(Hg) + Count(Pb) * Weight(Pb) + Count(Fe) * Weight(Fe) + Count(Cu) * Weight(Cu) + Count(Co) * Weight(Co) + Count(V) * Weight(V) + Count(Y) * Weight(Y) + Count(Cr) * Weight(Cr) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 238.02891 + 1 * 15.9994 + 1 * 12.0107 + 1 * 10.811 + 1 * 14.0067 + 1 * 18.9984032 + 1 * 39.948 + 1 * 22.98976928 + 1 * 39.0983 + 1 * 26.9815386 + 1 * 32.065 + 1 * 35.453 + 1 * 20.1797 + 1 * 131.293 + 1 * 83.798 + 1 * 226.0254098 + 1 * 126.90447 + 1 * 74.9216 + 1 * 209.987148 + 1 * 78.96 + 1 * 208.9824304 + 1 * 195.084 + 1 * 196.966569 + 1 * 69.723 + 1 * 72.64 + 1 * 200.59 + 1 * 207.2 + 1 * 55.845 + 1 * 63.546 + 1 * 58.933195 + 1 * 50.9415 + 1 * 88.90585 + 1 * 51.9961 =
2991.7652 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsAtAuBClCoCrCuFFeGaGeHeHgIKKrLiNNaNeOPbPoPtRaSSeUVXeY

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, T, Ph, Me, Et, Bu, AcAc, For, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
  • parenthesis () or brackets [].
  • Common compound names.
Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, nitric acid, potassium permanganate, ethanol, fructose, caffeine, water.

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

  • 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.
  • Mole is a standard scientific unit for measuring large quantities of very small entities such as atoms and molecules. One mole contains exactly 6.022 ×1023 particles (Avogadro's number)

Steps to calculate molar mass

  1. Identify the compound: write down the chemical formula of the compound. For example, water is H2O, meaning it contains two hydrogen atoms and one oxygen atom.
  2. Find atomic masses: look up the atomic masses of each element present in the compound. The atomic mass is usually found on the periodic table and is given in atomic mass units (amu).
  3. Calculate molar mass of each element: multiply the atomic mass of each element by the number of atoms of that element in the compound.
  4. Add them together: add the results from step 3 to get the total molar mass of the compound.

Example: calculating molar mass

Let's calculate the molar mass of carbon dioxide (CO2):

  • Carbon (C) has an atomic mass of about 12.01 amu.
  • Oxygen (O) has an atomic mass of about 16.00 amu.
  • CO2 has one carbon atom and two oxygen atoms.
  • The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol.

Lesson on computing molar mass

Weights of atoms and isotopes are from NIST article.

Related: Molecular weights of amino acids

molecular weights calculated today
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