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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HFONpHeNeArKrXeRnAuZnCdHgCnCuAgRgNiPdPtDsCoRhIrMtFeRuOsHsMnTcCrMo is 4263.0110 g/mol

Convert between HFONpHeNeArKrXeRnAuZnCdHgCnCuAgRgNiPdPtDsCoRhIrMtFeRuOsHsMnTcCrMo weight and moles
CompoundMolesWeight, g
HFONpHeNeArKrXeRnAuZnCdHgCnCuAgRgNiPdPtDsCoRhIrMtFeRuOsHsMnTcCrMo

Elemental composition of HFONpHeNeArKrXeRnAuZnCdHgCnCuAgRgNiPdPtDsCoRhIrMtFeRuOsHsMnTcCrMo
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0236
FluorineF18.998403210.4457
OxygenO15.999410.3753
NeptuniumNp236.0465715.5371
HeliumHe4.00260210.0939
NeonNe20.179710.4734
ArgonAr39.94810.9371
KryptonKr83.79811.9657
XenonXe131.29313.0798
RadonRn210.99060114.9493
GoldAu196.96656914.6204
ZincZn65.3811.5337
CadmiumCd112.41112.6369
MercuryHg200.5914.7054
CoperniciumCn285.174116.6895
CopperCu63.54611.4906
SilverAg107.868212.5303
RoentgeniumRg280.164516.5720
NickelNi58.693411.3768
PalladiumPd106.4212.4964
PlatinumPt195.08414.5762
DarmstadtiumDs281.162116.5954
CobaltCo58.93319511.3824
RhodiumRh102.9055012.4139
IridiumIr192.21714.5089
MeitneriumMt276.151216.4778
IronFe55.84511.3100
RutheniumRu101.0712.3709
OsmiumOs190.2314.4623
HassiumHs270.134716.3367
ManganeseMn54.93804511.2887
TechnetiumTc96.90636512.2732
ChromiumCr51.996111.2197
MolybdenumMo95.9612.2510

Computing molar mass step by step

First, compute the number of each atom in HFONpHeNeArKrXeRnAuZnCdHgCnCuAgRgNiPdPtDsCoRhIrMtFeRuOsHsMnTcCrMo:
H: 1, F: 1, O: 1, Np: 1, He: 1, Ne: 1, Ar: 1, Kr: 1, Xe: 1, Rn: 1, Au: 1, Zn: 1, Cd: 1, Hg: 1, Cn: 1, Cu: 1, Ag: 1, Rg: 1, Ni: 1, Pd: 1, Pt: 1, Ds: 1, Co: 1, Rh: 1, Ir: 1, Mt: 1, Fe: 1, Ru: 1, Os: 1, Hs: 1, Mn: 1, Tc: 1, Cr: 1, Mo: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, F: 18.9984032, O: 15.9994, Np: 236.04657, He: 4.002602, Ne: 20.1797, Ar: 39.948, Kr: 83.798, Xe: 131.293, Rn: 210.990601, Au: 196.966569, Zn: 65.38, Cd: 112.411, Hg: 200.59, Cn: 285.17411, Cu: 63.546, Ag: 107.8682, Rg: 280.16447, Ni: 58.6934, Pd: 106.42, Pt: 195.084, Ds: 281.16206, Co: 58.933195, Rh: 102.9055, Ir: 192.217, Mt: 276.15116, Fe: 55.845, Ru: 101.07, Os: 190.23, Hs: 270.13465, Mn: 54.938045, Tc: 96.906365, Cr: 51.9961, Mo: 95.96

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HFONpHeNeArKrXeRnAuZnCdHgCnCuAgRgNiPdPtDsCoRhIrMtFeRuOsHsMnTcCrMo) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(F) * Weight(F) + Count(O) * Weight(O) + Count(Np) * Weight(Np) + Count(He) * Weight(He) + Count(Ne) * Weight(Ne) + Count(Ar) * Weight(Ar) + Count(Kr) * Weight(Kr) + Count(Xe) * Weight(Xe) + Count(Rn) * Weight(Rn) + Count(Au) * Weight(Au) + Count(Zn) * Weight(Zn) + Count(Cd) * Weight(Cd) + Count(Hg) * Weight(Hg) + Count(Cn) * Weight(Cn) + Count(Cu) * Weight(Cu) + Count(Ag) * Weight(Ag) + Count(Rg) * Weight(Rg) + Count(Ni) * Weight(Ni) + Count(Pd) * Weight(Pd) + Count(Pt) * Weight(Pt) + Count(Ds) * Weight(Ds) + Count(Co) * Weight(Co) + Count(Rh) * Weight(Rh) + Count(Ir) * Weight(Ir) + Count(Mt) * Weight(Mt) + Count(Fe) * Weight(Fe) + Count(Ru) * Weight(Ru) + Count(Os) * Weight(Os) + Count(Hs) * Weight(Hs) + Count(Mn) * Weight(Mn) + Count(Tc) * Weight(Tc) + Count(Cr) * Weight(Cr) + Count(Mo) * Weight(Mo) =
1 * 1.00794 + 1 * 18.9984032 + 1 * 15.9994 + 1 * 236.04657 + 1 * 4.002602 + 1 * 20.1797 + 1 * 39.948 + 1 * 83.798 + 1 * 131.293 + 1 * 210.990601 + 1 * 196.966569 + 1 * 65.38 + 1 * 112.411 + 1 * 200.59 + 1 * 285.17411 + 1 * 63.546 + 1 * 107.8682 + 1 * 280.16447 + 1 * 58.6934 + 1 * 106.42 + 1 * 195.084 + 1 * 281.16206 + 1 * 58.933195 + 1 * 102.9055 + 1 * 192.217 + 1 * 276.15116 + 1 * 55.845 + 1 * 101.07 + 1 * 190.23 + 1 * 270.13465 + 1 * 54.938045 + 1 * 96.906365 + 1 * 51.9961 + 1 * 95.96 =
4263.0110 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgArAuCdCnCoCrCuDsFFeHHeHgHsIrKrMnMoMtNeNiNpOOsPdPtRgRhRnRuTcXeZn

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, 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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