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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of LaCeNdPmSmEuGdTbCHoErTmYbHLuAgThPaUNPAmCmBkCfEsFmMdNoLr is 5171.5406 g/mol

Convert between LaCeNdPmSmEuGdTbCHoErTmYbHLuAgThPaUNPAmCmBkCfEsFmMdNoLr weight and moles
CompoundMolesWeight, g
LaCeNdPmSmEuGdTbCHoErTmYbHLuAgThPaUNPAmCmBkCfEsFmMdNoLr

Elemental composition of LaCeNdPmSmEuGdTbCHoErTmYbHLuAgThPaUNPAmCmBkCfEsFmMdNoLr
ElementSymbolAtomic weightAtomsMass percent
LanthanumLa138.9054712.6860
CeriumCe140.11612.7094
NeodymiumNd144.24212.7891
PromethiumPm144.91274912.8021
SamariumSm150.3612.9075
EuropiumEu151.96412.9385
GadoliniumGd157.2513.0407
TerbiumTb158.9253513.0731
CarbonC12.010710.2322
HolmiumHo164.9303213.1892
ErbiumEr167.25913.2342
ThuliumTm168.9342113.2666
YtterbiumYb173.05413.3463
HydrogenH1.0079410.0195
LutetiumLu174.966813.3833
SilverAg107.868212.0858
ThoriumTh232.0380614.4868
ProtactiniumPa231.0358814.4674
UraniumU238.0289114.6027
NitrogenN14.006710.2708
PhosphorusP30.97376210.5989
AmericiumAm241.05682914.6612
CuriumCm243.06138914.7000
BerkeliumBk247.07030714.7775
CaliforniumCf249.07485314.8163
EinsteiniumEs252.0829814.8744
FermiumFm257.09510514.9713
MendeleviumMd258.09843114.9907
NobeliumNo259.101015.0101
LawrenciumLr262.109615.0683

Computing molar mass step by step

First, compute the number of each atom in LaCeNdPmSmEuGdTbCHoErTmYbHLuAgThPaUNPAmCmBkCfEsFmMdNoLr:
La: 1, Ce: 1, Nd: 1, Pm: 1, Sm: 1, Eu: 1, Gd: 1, Tb: 1, C: 1, Ho: 1, Er: 1, Tm: 1, Yb: 1, H: 1, Lu: 1, Ag: 1, Th: 1, Pa: 1, U: 1, N: 1, P: 1, Am: 1, Cm: 1, Bk: 1, Cf: 1, Es: 1, Fm: 1, Md: 1, No: 1, Lr: 1

Then, lookup atomic weights for each element in periodic table:
La: 138.90547, Ce: 140.116, Nd: 144.242, Pm: 144.912749, Sm: 150.36, Eu: 151.964, Gd: 157.25, Tb: 158.92535, C: 12.0107, Ho: 164.93032, Er: 167.259, Tm: 168.93421, Yb: 173.054, H: 1.00794, Lu: 174.9668, Ag: 107.8682, Th: 232.03806, Pa: 231.03588, U: 238.02891, N: 14.0067, P: 30.973762, 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

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (LaCeNdPmSmEuGdTbCHoErTmYbHLuAgThPaUNPAmCmBkCfEsFmMdNoLr) = ∑ Counti * Weighti =
Count(La) * Weight(La) + Count(Ce) * Weight(Ce) + Count(Nd) * Weight(Nd) + Count(Pm) * Weight(Pm) + Count(Sm) * Weight(Sm) + Count(Eu) * Weight(Eu) + Count(Gd) * Weight(Gd) + Count(Tb) * Weight(Tb) + Count(C) * Weight(C) + Count(Ho) * Weight(Ho) + Count(Er) * Weight(Er) + Count(Tm) * Weight(Tm) + Count(Yb) * Weight(Yb) + Count(H) * Weight(H) + Count(Lu) * Weight(Lu) + Count(Ag) * Weight(Ag) + Count(Th) * Weight(Th) + Count(Pa) * Weight(Pa) + Count(U) * Weight(U) + Count(N) * Weight(N) + Count(P) * Weight(P) + 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) =
1 * 138.90547 + 1 * 140.116 + 1 * 144.242 + 1 * 144.912749 + 1 * 150.36 + 1 * 151.964 + 1 * 157.25 + 1 * 158.92535 + 1 * 12.0107 + 1 * 164.93032 + 1 * 167.259 + 1 * 168.93421 + 1 * 173.054 + 1 * 1.00794 + 1 * 174.9668 + 1 * 107.8682 + 1 * 232.03806 + 1 * 231.03588 + 1 * 238.02891 + 1 * 14.0067 + 1 * 30.973762 + 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 =
5171.5406 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAmBkCeCfCmErEsEuFmGdHoLaLrLuMdNNdNoPPaPmSmTbThTmUYb

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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