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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of AcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhLuYbTmErHoDyTbGdEuSmPmI is 6649.4518 g/mol

Convert between AcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhLuYbTmErHoDyTbGdEuSmPmI weight and moles
CompoundMolesWeight, g
AcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhLuYbTmErHoDyTbGdEuSmPmI

Elemental composition of AcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhLuYbTmErHoDyTbGdEuSmPmI
ElementSymbolAtomic weightAtomsMass percent
ActiniumAc227.02775213.4142
ThoriumTh232.0380613.4896
ProtactiniumPa231.0358813.4745
UraniumU238.0289113.5797
NeptuniumNp236.0465713.5499
PlutoniumPu238.04956013.5800
AmericiumAm241.05682913.6252
CuriumCm243.06138913.6554
BerkeliumBk247.07030713.7156
CaliforniumCf249.07485313.7458
EinsteiniumEs252.0829813.7910
FermiumFm257.09510513.8664
MendeleviumMd258.09843113.8815
NobeliumNo259.101013.8966
LawrenciumLr262.109613.9418
RutherfordiumRf265.116713.9870
DubniumDb268.125514.0323
SeaborgiumSg271.133514.0775
BohriumBh272.138014.0926
LutetiumLu174.966812.6313
YtterbiumYb173.05412.6025
ThuliumTm168.9342112.5406
ErbiumEr167.25912.5154
HolmiumHo164.9303212.4804
DysprosiumDy162.50012.4438
TerbiumTb158.9253512.3901
GadoliniumGd157.2512.3649
EuropiumEu151.96412.2854
SamariumSm150.3612.2612
PromethiumPm144.91274912.1793
IodineI126.9044711.9085

Computing molar mass step by step

First, compute the number of each atom in AcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhLuYbTmErHoDyTbGdEuSmPmI:
Ac: 1, Th: 1, Pa: 1, U: 1, Np: 1, Pu: 1, Am: 1, Cm: 1, Bk: 1, Cf: 1, Es: 1, Fm: 1, Md: 1, No: 1, Lr: 1, Rf: 1, Db: 1, Sg: 1, Bh: 1, Lu: 1, Yb: 1, Tm: 1, Er: 1, Ho: 1, Dy: 1, Tb: 1, Gd: 1, Eu: 1, Sm: 1, Pm: 1, I: 1

Then, lookup atomic weights for each element in periodic table:
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, Fm: 257.095105, Md: 258.098431, No: 259.10103, Lr: 262.10963, Rf: 265.1167, Db: 268.12545, Sg: 271.13347, Bh: 272.13803, Lu: 174.9668, Yb: 173.054, Tm: 168.93421, Er: 167.259, Ho: 164.93032, Dy: 162.5, Tb: 158.92535, Gd: 157.25, Eu: 151.964, Sm: 150.36, Pm: 144.912749, I: 126.90447

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (AcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhLuYbTmErHoDyTbGdEuSmPmI) = ∑ Counti * Weighti =
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(Fm) * Weight(Fm) + 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(Lu) * Weight(Lu) + Count(Yb) * Weight(Yb) + Count(Tm) * Weight(Tm) + Count(Er) * Weight(Er) + Count(Ho) * Weight(Ho) + Count(Dy) * Weight(Dy) + Count(Tb) * Weight(Tb) + Count(Gd) * Weight(Gd) + Count(Eu) * Weight(Eu) + Count(Sm) * Weight(Sm) + Count(Pm) * Weight(Pm) + Count(I) * Weight(I) =
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 * 257.095105 + 1 * 258.098431 + 1 * 259.10103 + 1 * 262.10963 + 1 * 265.1167 + 1 * 268.12545 + 1 * 271.13347 + 1 * 272.13803 + 1 * 174.9668 + 1 * 173.054 + 1 * 168.93421 + 1 * 167.259 + 1 * 164.93032 + 1 * 162.5 + 1 * 158.92535 + 1 * 157.25 + 1 * 151.964 + 1 * 150.36 + 1 * 144.912749 + 1 * 126.90447 =
6649.4518 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAmBhBkCfCmDbDyErEsEuFmGdHoILrLuMdNoNpPaPmPuRfSgSmTbThTmUYb

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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