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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv is 7021.5139 g/mol

Convert between HoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv weight and moles
CompoundMolesWeight, g
HoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv

Elemental composition of HoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv
ElementSymbolAtomic weightAtomsMass percent
HolmiumHo164.9303212.3489
ErbiumEr167.25912.3821
ThuliumTm168.9342112.4060
YtterbiumYb173.05412.4646
LutetiumLu174.966812.4919
ActiniumAc227.02775213.2333
ThoriumTh232.0380613.3047
ProtactiniumPa231.0358813.2904
UraniumU238.0289113.3900
NeptuniumNp236.0465713.3618
PlutoniumPu238.04956013.3903
AmericiumAm241.05682913.4331
CuriumCm243.06138913.4617
BerkeliumBk247.07030713.5188
CaliforniumCf249.07485313.5473
EinsteiniumEs252.0829813.5902
MendeleviumMd258.09843113.6758
NobeliumNo259.101013.6901
LawrenciumLr262.109613.7330
RutherfordiumRf265.116713.7758
DubniumDb268.125513.8186
SeaborgiumSg271.133513.8615
BohriumBh272.138013.8758
HassiumHs270.134713.8472
MeitneriumMt276.151213.9329
DarmstadtiumDs281.162114.0043
RoentgeniumRg280.164513.9901
CoperniciumCn285.174114.0614
FleroviumFl289.187314.1186
LivermoriumLv0.000000010.0000

Computing molar mass step by step

First, compute the number of each atom in HoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv:
Ho: 1, Er: 1, Tm: 1, Yb: 1, Lu: 1, Ac: 1, Th: 1, Pa: 1, U: 1, Np: 1, Pu: 1, Am: 1, Cm: 1, Bk: 1, Cf: 1, Es: 1, Md: 1, No: 1, Lr: 1, Rf: 1, Db: 1, Sg: 1, Bh: 1, Hs: 1, Mt: 1, Ds: 1, Rg: 1, Cn: 1, Fl: 1, Lv: 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, 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, Cf: 249.0748535, Es: 252.08298, Md: 258.098431, No: 259.10103, Lr: 262.10963, Rf: 265.1167, Db: 268.12545, Sg: 271.13347, Bh: 272.13803, Hs: 270.13465, Mt: 276.15116, Ds: 281.16206, Rg: 280.16447, Cn: 285.17411, Fl: 289.18728, Lv: 0

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv) = ∑ Counti * Weighti =
Count(Ho) * Weight(Ho) + Count(Er) * Weight(Er) + Count(Tm) * Weight(Tm) + Count(Yb) * Weight(Yb) + Count(Lu) * Weight(Lu) + 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) + Count(Cf) * Weight(Cf) + Count(Es) * Weight(Es) + Count(Md) * Weight(Md) + Count(No) * Weight(No) + Count(Lr) * Weight(Lr) + Count(Rf) * Weight(Rf) + Count(Db) * Weight(Db) + Count(Sg) * Weight(Sg) + Count(Bh) * Weight(Bh) + Count(Hs) * Weight(Hs) + Count(Mt) * Weight(Mt) + Count(Ds) * Weight(Ds) + Count(Rg) * Weight(Rg) + Count(Cn) * Weight(Cn) + Count(Fl) * Weight(Fl) + Count(Lv) * Weight(Lv) =
1 * 164.93032 + 1 * 167.259 + 1 * 168.93421 + 1 * 173.054 + 1 * 174.9668 + 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 + 1 * 249.0748535 + 1 * 252.08298 + 1 * 258.098431 + 1 * 259.10103 + 1 * 262.10963 + 1 * 265.1167 + 1 * 268.12545 + 1 * 271.13347 + 1 * 272.13803 + 1 * 270.13465 + 1 * 276.15116 + 1 * 281.16206 + 1 * 280.16447 + 1 * 285.17411 + 1 * 289.18728 + 1 * 0 =
7021.5139 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAmBhBkCfCmCnDbDsErEsFlHoHsLrLuLvMdMtNoNpPaPuRfRgSgThTmUYb

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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