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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPu is 5640.4777 g/mol

Convert between HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPu weight and moles
CompoundMolesWeight, g
HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPu

Elemental composition of HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPu
ElementSymbolAtomic weightAtomsMass percent
HolmiumHo164.9303212.9240
ErbiumEr167.25912.9653
ThuliumTm168.9342112.9950
YtterbiumYb173.05413.0681
LutetiumLu174.966813.1020
HafniumHf178.4913.1644
TantalumTa180.9478813.2080
TungstenW183.8413.2593
RheniumRe186.20713.3013
OsmiumOs190.2313.3726
IridiumIr192.21713.4078
PlatinumPt195.08413.4586
GoldAu196.96656913.4920
MercuryHg200.5913.5563
ThalliumTl204.383313.6235
LeadPb207.213.6734
BismuthBi208.9804013.7050
PoloniumPo208.98243013.7050
AstatineAt209.98714813.7229
RadonRn210.99060127.4813
FranciumFr223.01973613.9539
ActiniumAc227.02775214.0250
ThoriumTh232.0380614.1138
ProtactiniumPa231.0358814.0960
UraniumU238.0289114.2200
NeptuniumNp236.0465714.1849
PlutoniumPu238.04956014.2204

Computing molar mass step by step

First, compute the number of each atom in HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPu:
Ho: 1, 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: 2, Fr: 1, Ac: 1, Th: 1, Pa: 1, U: 1, Np: 1, Pu: 1

Then, lookup atomic weights for each element in periodic table:
Ho: 164.93032, 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, Ac: 227.0277521, Th: 232.03806, Pa: 231.03588, U: 238.02891, Np: 236.04657, Pu: 238.0495599

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPu) = ∑ Counti * Weighti =
Count(Ho) * Weight(Ho) + 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(Ac) * Weight(Ac) + Count(Th) * Weight(Th) + Count(Pa) * Weight(Pa) + Count(U) * Weight(U) + Count(Np) * Weight(Np) + Count(Pu) * Weight(Pu) =
1 * 164.93032 + 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 + 2 * 210.990601 + 1 * 223.0197359 + 1 * 227.0277521 + 1 * 232.03806 + 1 * 231.03588 + 1 * 238.02891 + 1 * 236.04657 + 1 * 238.0495599 =
5640.4777 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAtAuBiErFrHfHgHoIrLuNpOsPaPbPoPtPuReRn2TaThTlTmUWYb

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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