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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of FeZnCuAuONeXeArCUPtPaPCaHHeErKPuGdRfFrHgMtEsAmMnVNaNoBa is 3926.3511 g/mol

Convert between FeZnCuAuONeXeArCUPtPaPCaHHeErKPuGdRfFrHgMtEsAmMnVNaNoBa weight and moles
CompoundMolesWeight, g
FeZnCuAuONeXeArCUPtPaPCaHHeErKPuGdRfFrHgMtEsAmMnVNaNoBa

Elemental composition of FeZnCuAuONeXeArCUPtPaPCaHHeErKPuGdRfFrHgMtEsAmMnVNaNoBa
ElementSymbolAtomic weightAtomsMass percent
IronFe55.84511.4223
ZincZn65.3811.6652
CopperCu63.54611.6184
GoldAu196.96656915.0165
OxygenO15.999410.4075
NeonNe20.179710.5140
XenonXe131.29313.3439
ArgonAr39.94811.0174
CarbonC12.010710.3059
UraniumU238.0289116.0623
PlatinumPt195.08414.9686
ProtactiniumPa231.0358815.8842
PhosphorusP30.97376210.7889
CalciumCa40.07811.0207
HydrogenH1.0079410.0257
HeliumHe4.00260210.1019
ErbiumEr167.25914.2599
PotassiumK39.098310.9958
PlutoniumPu238.04956016.0629
GadoliniumGd157.2514.0050
RutherfordiumRf265.116716.7522
FranciumFr223.01973615.6801
MercuryHg200.5915.1088
MeitneriumMt276.151217.0333
EinsteiniumEs252.0829816.4203
AmericiumAm241.05682916.1395
ManganeseMn54.93804511.3992
VanadiumV50.941511.2974
SodiumNa22.9897692810.5855
NobeliumNo259.101016.5990
BariumBa137.32713.4976

Computing molar mass step by step

First, compute the number of each atom in FeZnCuAuONeXeArCUPtPaPCaHHeErKPuGdRfFrHgMtEsAmMnVNaNoBa:
Fe: 1, Zn: 1, Cu: 1, Au: 1, O: 1, Ne: 1, Xe: 1, Ar: 1, C: 1, U: 1, Pt: 1, Pa: 1, P: 1, Ca: 1, H: 1, He: 1, Er: 1, K: 1, Pu: 1, Gd: 1, Rf: 1, Fr: 1, Hg: 1, Mt: 1, Es: 1, Am: 1, Mn: 1, V: 1, Na: 1, No: 1, Ba: 1

Then, lookup atomic weights for each element in periodic table:
Fe: 55.845, Zn: 65.38, Cu: 63.546, Au: 196.966569, O: 15.9994, Ne: 20.1797, Xe: 131.293, Ar: 39.948, C: 12.0107, U: 238.02891, Pt: 195.084, Pa: 231.03588, P: 30.973762, Ca: 40.078, H: 1.00794, He: 4.002602, Er: 167.259, K: 39.0983, Pu: 238.0495599, Gd: 157.25, Rf: 265.1167, Fr: 223.0197359, Hg: 200.59, Mt: 276.15116, Es: 252.08298, Am: 241.0568291, Mn: 54.938045, V: 50.9415, Na: 22.98976928, No: 259.10103, Ba: 137.327

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (FeZnCuAuONeXeArCUPtPaPCaHHeErKPuGdRfFrHgMtEsAmMnVNaNoBa) = ∑ Counti * Weighti =
Count(Fe) * Weight(Fe) + Count(Zn) * Weight(Zn) + Count(Cu) * Weight(Cu) + Count(Au) * Weight(Au) + Count(O) * Weight(O) + Count(Ne) * Weight(Ne) + Count(Xe) * Weight(Xe) + Count(Ar) * Weight(Ar) + Count(C) * Weight(C) + Count(U) * Weight(U) + Count(Pt) * Weight(Pt) + Count(Pa) * Weight(Pa) + Count(P) * Weight(P) + Count(Ca) * Weight(Ca) + Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Er) * Weight(Er) + Count(K) * Weight(K) + Count(Pu) * Weight(Pu) + Count(Gd) * Weight(Gd) + Count(Rf) * Weight(Rf) + Count(Fr) * Weight(Fr) + Count(Hg) * Weight(Hg) + Count(Mt) * Weight(Mt) + Count(Es) * Weight(Es) + Count(Am) * Weight(Am) + Count(Mn) * Weight(Mn) + Count(V) * Weight(V) + Count(Na) * Weight(Na) + Count(No) * Weight(No) + Count(Ba) * Weight(Ba) =
1 * 55.845 + 1 * 65.38 + 1 * 63.546 + 1 * 196.966569 + 1 * 15.9994 + 1 * 20.1797 + 1 * 131.293 + 1 * 39.948 + 1 * 12.0107 + 1 * 238.02891 + 1 * 195.084 + 1 * 231.03588 + 1 * 30.973762 + 1 * 40.078 + 1 * 1.00794 + 1 * 4.002602 + 1 * 167.259 + 1 * 39.0983 + 1 * 238.0495599 + 1 * 157.25 + 1 * 265.1167 + 1 * 223.0197359 + 1 * 200.59 + 1 * 276.15116 + 1 * 252.08298 + 1 * 241.0568291 + 1 * 54.938045 + 1 * 50.9415 + 1 * 22.98976928 + 1 * 259.10103 + 1 * 137.327 =
3926.3511 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAmArAuBaCaCuErEsFeFrGdHeHgKMnMtNaNeNoOPPaPtPuRfUVXeZn

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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