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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of ErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRaAcThPaUPuAmCmBkCfEs is 6486.8820 g/mol

Convert between ErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRaAcThPaUPuAmCmBkCfEs weight and moles
CompoundMolesWeight, g
ErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRaAcThPaUPuAmCmBkCfEs

Elemental composition of ErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRaAcThPaUPuAmCmBkCfEs
ElementSymbolAtomic weightAtomsMass percent
ErbiumEr167.25912.5784
ThuliumTm168.9342112.6042
YtterbiumYb173.05412.6678
LutetiumLu174.966812.6972
HafniumHf178.4912.7516
TantalumTa180.9478812.7894
TungstenW183.8412.8340
RheniumRe186.20712.8705
OsmiumOs190.2312.9325
IridiumIr192.21712.9632
PlatinumPt195.08413.0074
GoldAu196.96656913.0364
MercuryHg200.5913.0922
ThalliumTl204.383313.1507
LeadPb207.213.1941
BismuthBi208.9804013.2216
PoloniumPo208.98243013.2216
AstatineAt209.98714813.2371
RadonRn210.99060113.2526
FranciumFr223.01973613.4380
RadiumRa226.02541013.4843
ActiniumAc227.02775213.4998
ThoriumTh232.0380613.5770
ProtactiniumPa231.0358813.5616
UraniumU238.0289113.6694
PlutoniumPu238.04956013.6697
AmericiumAm241.05682913.7161
CuriumCm243.06138913.7470
BerkeliumBk247.07030713.8088
CaliforniumCf249.07485313.8397
EinsteiniumEs252.0829813.8860

Computing molar mass step by step

First, compute the number of each atom in ErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRaAcThPaUPuAmCmBkCfEs:
Er: 1, Tm: 1, Yb: 1, Lu: 1, Hf: 1, Ta: 1, W: 1, Re: 1, Os: 1, Ir: 1, Pt: 1, Au: 1, Hg: 1, Tl: 1, Pb: 1, Bi: 1, Po: 1, At: 1, Rn: 1, Fr: 1, Ra: 1, Ac: 1, Th: 1, Pa: 1, U: 1, Pu: 1, Am: 1, Cm: 1, Bk: 1, Cf: 1, Es: 1

Then, lookup atomic weights for each element in periodic table:
Er: 167.259, Tm: 168.93421, Yb: 173.054, Lu: 174.9668, Hf: 178.49, Ta: 180.94788, W: 183.84, Re: 186.207, Os: 190.23, Ir: 192.217, Pt: 195.084, Au: 196.966569, Hg: 200.59, Tl: 204.3833, Pb: 207.2, Bi: 208.9804, Po: 208.9824304, At: 209.987148, Rn: 210.990601, Fr: 223.0197359, Ra: 226.0254098, Ac: 227.0277521, Th: 232.03806, Pa: 231.03588, U: 238.02891, Pu: 238.0495599, Am: 241.0568291, Cm: 243.0613891, Bk: 247.070307, Cf: 249.0748535, Es: 252.08298

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (ErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRaAcThPaUPuAmCmBkCfEs) = ∑ Counti * Weighti =
Count(Er) * Weight(Er) + Count(Tm) * Weight(Tm) + Count(Yb) * Weight(Yb) + Count(Lu) * Weight(Lu) + 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) + Count(Au) * Weight(Au) + Count(Hg) * Weight(Hg) + Count(Tl) * Weight(Tl) + Count(Pb) * Weight(Pb) + Count(Bi) * Weight(Bi) + Count(Po) * Weight(Po) + Count(At) * Weight(At) + Count(Rn) * Weight(Rn) + Count(Fr) * Weight(Fr) + Count(Ra) * Weight(Ra) + Count(Ac) * Weight(Ac) + Count(Th) * Weight(Th) + Count(Pa) * Weight(Pa) + Count(U) * Weight(U) + Count(Pu) * Weight(Pu) + Count(Am) * Weight(Am) + Count(Cm) * Weight(Cm) + Count(Bk) * Weight(Bk) + Count(Cf) * Weight(Cf) + Count(Es) * Weight(Es) =
1 * 167.259 + 1 * 168.93421 + 1 * 173.054 + 1 * 174.9668 + 1 * 178.49 + 1 * 180.94788 + 1 * 183.84 + 1 * 186.207 + 1 * 190.23 + 1 * 192.217 + 1 * 195.084 + 1 * 196.966569 + 1 * 200.59 + 1 * 204.3833 + 1 * 207.2 + 1 * 208.9804 + 1 * 208.9824304 + 1 * 209.987148 + 1 * 210.990601 + 1 * 223.0197359 + 1 * 226.0254098 + 1 * 227.0277521 + 1 * 232.03806 + 1 * 231.03588 + 1 * 238.02891 + 1 * 238.0495599 + 1 * 241.0568291 + 1 * 243.0613891 + 1 * 247.070307 + 1 * 249.0748535 + 1 * 252.08298 =
6486.8820 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAmAtAuBiBkCfCmErEsFrHfHgIrLuOsPaPbPoPtPuRaReRnTaThTlTmUWYb

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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