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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPuAmCmBk is 6371.6663 g/mol

Convert between HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPuAmCmBk weight and moles
CompoundMolesWeight, g
HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPuAmCmBk

Elemental composition of HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPuAmCmBk
ElementSymbolAtomic weightAtomsMass percent
HolmiumHo164.9303212.5885
ErbiumEr167.25912.6250
ThuliumTm168.9342112.6513
YtterbiumYb173.05412.7160
LutetiumLu174.966812.7460
HafniumHf178.4912.8013
TantalumTa180.9478812.8399
TungstenW183.8412.8853
RheniumRe186.20712.9224
OsmiumOs190.2312.9856
IridiumIr192.21713.0167
PlatinumPt195.08413.0617
GoldAu196.96656913.0913
MercuryHg200.5913.1482
ThalliumTl204.383313.2077
LeadPb207.213.2519
BismuthBi208.9804013.2798
PoloniumPo208.98243013.2799
AstatineAt209.98714813.2956
RadonRn210.99060126.6228
FranciumFr223.01973613.5002
ActiniumAc227.02775213.5631
ThoriumTh232.0380613.6417
ProtactiniumPa231.0358813.6260
UraniumU238.0289113.7357
NeptuniumNp236.0465713.7046
PlutoniumPu238.04956013.7361
AmericiumAm241.05682913.7833
CuriumCm243.06138913.8147
BerkeliumBk247.07030713.8776

Computing molar mass step by step

First, compute the number of each atom in HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPuAmCmBk:
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, Am: 1, Cm: 1, Bk: 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, Am: 241.0568291, Cm: 243.0613891, Bk: 247.070307

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRnAcThPaUNpPuAmCmBk) = ∑ 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) + Count(Am) * Weight(Am) + Count(Cm) * Weight(Cm) + Count(Bk) * Weight(Bk) =
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 + 1 * 241.0568291 + 1 * 243.0613891 + 1 * 247.070307 =
6371.6663 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAmAtAuBiBkCmErFrHfHgHoIrLuNpOsPaPbPoPtPuReRn2TaThTlTmUWYb

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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