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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of NdThPaUNpPuAmCmBkCfEsFmMdNoLrRfIDbSgBhLuYbTmErHoDyTbGdEuSmPm is 6566.6661 g/mol

Convert between NdThPaUNpPuAmCmBkCfEsFmMdNoLrRfIDbSgBhLuYbTmErHoDyTbGdEuSmPm weight and moles
CompoundMolesWeight, g
NdThPaUNpPuAmCmBkCfEsFmMdNoLrRfIDbSgBhLuYbTmErHoDyTbGdEuSmPm

Elemental composition of NdThPaUNpPuAmCmBkCfEsFmMdNoLrRfIDbSgBhLuYbTmErHoDyTbGdEuSmPm
ElementSymbolAtomic weightAtomsMass percent
NeodymiumNd144.24212.1966
ThoriumTh232.0380613.5336
ProtactiniumPa231.0358813.5183
UraniumU238.0289113.6248
NeptuniumNp236.0465713.5946
PlutoniumPu238.04956013.6251
AmericiumAm241.05682913.6709
CuriumCm243.06138913.7014
BerkeliumBk247.07030713.7625
CaliforniumCf249.07485313.7930
EinsteiniumEs252.0829813.8388
FermiumFm257.09510513.9152
MendeleviumMd258.09843113.9304
NobeliumNo259.101013.9457
LawrenciumLr262.109613.9915
RutherfordiumRf265.116714.0373
IodineI126.9044711.9326
DubniumDb268.125514.0831
SeaborgiumSg271.133514.1289
BohriumBh272.138014.1442
LutetiumLu174.966812.6645
YtterbiumYb173.05412.6353
ThuliumTm168.9342112.5726
ErbiumEr167.25912.5471
HolmiumHo164.9303212.5116
DysprosiumDy162.50012.4746
TerbiumTb158.9253512.4202
GadoliniumGd157.2512.3947
EuropiumEu151.96412.3142
SamariumSm150.3612.2897
PromethiumPm144.91274912.2068

Computing molar mass step by step

First, compute the number of each atom in NdThPaUNpPuAmCmBkCfEsFmMdNoLrRfIDbSgBhLuYbTmErHoDyTbGdEuSmPm:
Nd: 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, I: 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

Then, lookup atomic weights for each element in periodic table:
Nd: 144.242, 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, I: 126.90447, 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

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (NdThPaUNpPuAmCmBkCfEsFmMdNoLrRfIDbSgBhLuYbTmErHoDyTbGdEuSmPm) = ∑ Counti * Weighti =
Count(Nd) * Weight(Nd) + 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(I) * Weight(I) + 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) =
1 * 144.242 + 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 * 126.90447 + 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 =
6566.6661 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AmBhBkCfCmDbDyErEsEuFmGdHoILrLuMdNdNoNpPaPmPuRfSgSmTbThTmUYb

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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