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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAuPbK is 3391.5900 g/mol

Convert between HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAuPbK weight and moles
CompoundMolesWeight, g
HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAuPbK

Elemental composition of HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAuPbK
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0297
HeliumHe4.00260210.1180
LithiumLi6.94110.2047
BerylliumBe9.01218210.2657
BoronB10.81110.3188
CarbonC12.010710.3541
OxygenO15.999410.4717
NitrogenN14.006710.4130
FluorineF18.998403210.5602
NeonNe20.179710.5950
SodiumNa22.9897692810.6778
ChlorineCl35.45311.0453
BromineBr79.90412.3559
UraniumU238.0289117.0182
PlutoniumPu238.04956017.0188
FleroviumFl289.187318.5266
PoloniumPo208.98243016.1618
BismuthBi208.9804016.1617
PhosphorusP30.97376210.9133
SulfurS32.06510.9454
ActiniumAc227.02775216.6938
LanthanumLa138.9054714.0956
YttriumY88.9058512.6214
CesiumCs132.905451913.9187
RubidiumRb85.467812.5200
RadiumRa226.02541016.6643
RadonRn210.99060116.2210
XenonXe131.29313.8711
ArgonAr39.94811.1779
IronFe55.84511.6466
CopperCu63.54611.8736
TitaniumTi47.86711.4113
GoldAu196.96656915.8075
LeadPb207.216.1092
PotassiumK39.098311.1528
HydrogenD2.014101777810.0594

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAuPbK:
H: 1, He: 1, Li: 1, Be: 1, B: 1, C: 1, O: 1, N: 1, F: 1, Ne: 1, Na: 1, Cl: 1, Br: 1, U: 1, Pu: 1, Fl: 1, Po: 1, Bi: 1, P: 1, S: 1, Ac: 1, La: 1, Y: 1, Cs: 1, Rb: 1, Ra: 1, Rn: 1, Xe: 1, Ar: 1, Fe: 1, Cu: 1, Ti: 1, Au: 1, Pb: 1, K: 1, D: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, O: 15.9994, N: 14.0067, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Cl: 35.453, Br: 79.904, U: 238.02891, Pu: 238.0495599, Fl: 289.18728, Po: 208.9824304, Bi: 208.9804, P: 30.973762, S: 32.065, Ac: 227.0277521, La: 138.90547, Y: 88.90585, Cs: 132.9054519, Rb: 85.4678, Ra: 226.0254098, Rn: 210.990601, Xe: 131.293, Ar: 39.948, Fe: 55.845, Cu: 63.546, Ti: 47.867, Au: 196.966569, Pb: 207.2, K: 39.0983, D: 2.0141017778

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAuPbK) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(O) * Weight(O) + Count(N) * Weight(N) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Cl) * Weight(Cl) + Count(Br) * Weight(Br) + Count(U) * Weight(U) + Count(Pu) * Weight(Pu) + Count(Fl) * Weight(Fl) + Count(Po) * Weight(Po) + Count(Bi) * Weight(Bi) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Ac) * Weight(Ac) + Count(La) * Weight(La) + Count(Y) * Weight(Y) + Count(Cs) * Weight(Cs) + Count(Rb) * Weight(Rb) + Count(Ra) * Weight(Ra) + Count(Rn) * Weight(Rn) + Count(Xe) * Weight(Xe) + Count(Ar) * Weight(Ar) + Count(Fe) * Weight(Fe) + Count(Cu) * Weight(Cu) + Count(Ti) * Weight(Ti) + Count(Au) * Weight(Au) + Count(Pb) * Weight(Pb) + Count(K) * Weight(K) + Count(D) * Weight(D) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 15.9994 + 1 * 14.0067 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 22.98976928 + 1 * 35.453 + 1 * 79.904 + 1 * 238.02891 + 1 * 238.0495599 + 1 * 289.18728 + 1 * 208.9824304 + 1 * 208.9804 + 1 * 30.973762 + 1 * 32.065 + 1 * 227.0277521 + 1 * 138.90547 + 1 * 88.90585 + 1 * 132.9054519 + 1 * 85.4678 + 1 * 226.0254098 + 1 * 210.990601 + 1 * 131.293 + 1 * 39.948 + 1 * 55.845 + 1 * 63.546 + 1 * 47.867 + 1 * 196.966569 + 1 * 207.2 + 1 * 39.0983 + 1 * 2.0141017778 =
3391.5900 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAcArAuBBeBiBrClCsCuFFeFlDHeKLaLiNNaNeOPPbPoPuRaRbRnSTiUXeY

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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