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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of AuHgAcRnTlFrRaPbBiPoAtXeRfYZrNbMoTcRuRhPdAgCdLaHfTaWReOsIrPt is 5163.0617 g/mol

Convert between AuHgAcRnTlFrRaPbBiPoAtXeRfYZrNbMoTcRuRhPdAgCdLaHfTaWReOsIrPt weight and moles
CompoundMolesWeight, g
AuHgAcRnTlFrRaPbBiPoAtXeRfYZrNbMoTcRuRhPdAgCdLaHfTaWReOsIrPt

Elemental composition of AuHgAcRnTlFrRaPbBiPoAtXeRfYZrNbMoTcRuRhPdAgCdLaHfTaWReOsIrPt
ElementSymbolAtomic weightAtomsMass percent
GoldAu196.96656913.8149
MercuryHg200.5913.8851
ActiniumAc227.02775214.3972
RadonRn210.99060114.0865
ThalliumTl204.383313.9586
FranciumFr223.01973614.3195
RadiumRa226.02541014.3777
LeadPb207.214.0131
BismuthBi208.9804014.0476
PoloniumPo208.98243014.0476
AstatineAt209.98714814.0671
XenonXe131.29312.5429
RutherfordiumRf265.116715.1349
YttriumY88.9058511.7220
ZirconiumZr91.22411.7669
NiobiumNb92.9063811.7994
MolybdenumMo95.9611.8586
TechnetiumTc96.90636511.8769
RutheniumRu101.0711.9576
RhodiumRh102.9055011.9931
PalladiumPd106.4212.0612
SilverAg107.868212.0892
CadmiumCd112.41112.1772
LanthanumLa138.9054712.6904
HafniumHf178.4913.4571
TantalumTa180.9478813.5047
TungstenW183.8413.5607
RheniumRe186.20713.6065
OsmiumOs190.2313.6844
IridiumIr192.21713.7229
PlatinumPt195.08413.7785

Computing molar mass step by step

First, compute the number of each atom in AuHgAcRnTlFrRaPbBiPoAtXeRfYZrNbMoTcRuRhPdAgCdLaHfTaWReOsIrPt:
Au: 1, Hg: 1, Ac: 1, Rn: 1, Tl: 1, Fr: 1, Ra: 1, Pb: 1, Bi: 1, Po: 1, At: 1, Xe: 1, Rf: 1, Y: 1, Zr: 1, Nb: 1, Mo: 1, Tc: 1, Ru: 1, Rh: 1, Pd: 1, Ag: 1, Cd: 1, La: 1, Hf: 1, Ta: 1, W: 1, Re: 1, Os: 1, Ir: 1, Pt: 1

Then, lookup atomic weights for each element in periodic table:
Au: 196.966569, Hg: 200.59, Ac: 227.0277521, Rn: 210.990601, Tl: 204.3833, Fr: 223.0197359, Ra: 226.0254098, Pb: 207.2, Bi: 208.9804, Po: 208.9824304, At: 209.987148, Xe: 131.293, Rf: 265.1167, Y: 88.90585, Zr: 91.224, Nb: 92.90638, Mo: 95.96, Tc: 96.906365, Ru: 101.07, Rh: 102.9055, Pd: 106.42, Ag: 107.8682, Cd: 112.411, La: 138.90547, Hf: 178.49, Ta: 180.94788, W: 183.84, Re: 186.207, Os: 190.23, Ir: 192.217, Pt: 195.084

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (AuHgAcRnTlFrRaPbBiPoAtXeRfYZrNbMoTcRuRhPdAgCdLaHfTaWReOsIrPt) = ∑ Counti * Weighti =
Count(Au) * Weight(Au) + Count(Hg) * Weight(Hg) + Count(Ac) * Weight(Ac) + Count(Rn) * Weight(Rn) + Count(Tl) * Weight(Tl) + Count(Fr) * Weight(Fr) + Count(Ra) * Weight(Ra) + Count(Pb) * Weight(Pb) + Count(Bi) * Weight(Bi) + Count(Po) * Weight(Po) + Count(At) * Weight(At) + Count(Xe) * Weight(Xe) + Count(Rf) * Weight(Rf) + Count(Y) * Weight(Y) + Count(Zr) * Weight(Zr) + Count(Nb) * Weight(Nb) + Count(Mo) * Weight(Mo) + Count(Tc) * Weight(Tc) + Count(Ru) * Weight(Ru) + Count(Rh) * Weight(Rh) + Count(Pd) * Weight(Pd) + Count(Ag) * Weight(Ag) + Count(Cd) * Weight(Cd) + Count(La) * Weight(La) + Count(Hf) * Weight(Hf) + Count(Ta) * Weight(Ta) + Count(W) * Weight(W) + Count(Re) * Weight(Re) + Count(Os) * Weight(Os) + Count(Ir) * Weight(Ir) + Count(Pt) * Weight(Pt) =
1 * 196.966569 + 1 * 200.59 + 1 * 227.0277521 + 1 * 210.990601 + 1 * 204.3833 + 1 * 223.0197359 + 1 * 226.0254098 + 1 * 207.2 + 1 * 208.9804 + 1 * 208.9824304 + 1 * 209.987148 + 1 * 131.293 + 1 * 265.1167 + 1 * 88.90585 + 1 * 91.224 + 1 * 92.90638 + 1 * 95.96 + 1 * 96.906365 + 1 * 101.07 + 1 * 102.9055 + 1 * 106.42 + 1 * 107.8682 + 1 * 112.411 + 1 * 138.90547 + 1 * 178.49 + 1 * 180.94788 + 1 * 183.84 + 1 * 186.207 + 1 * 190.23 + 1 * 192.217 + 1 * 195.084 =
5163.0617 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAgAtAuBiCdFrHfHgIrLaMoNbOsPbPdPoPtRaReRfRhRnRuTaTcTlWXeYZr

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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