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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of U7DbRfLrNoMdFmEsCfBkCmAmPuNpUPaThLuYbTmErHoDy is 6655.0384 g/mol

Convert between U7DbRfLrNoMdFmEsCfBkCmAmPuNpUPaThLuYbTmErHoDy weight and moles
CompoundMolesWeight, g
U7DbRfLrNoMdFmEsCfBkCmAmPuNpUPaThLuYbTmErHoDy

Elemental composition of U7DbRfLrNoMdFmEsCfBkCmAmPuNpUPaThLuYbTmErHoDy
ElementSymbolAtomic weightAtomsMass percent
UraniumU238.02891828.6134
DubniumDb268.125514.0289
RutherfordiumRf265.116713.9837
LawrenciumLr262.109613.9385
NobeliumNo259.101013.8933
MendeleviumMd258.09843113.8782
FermiumFm257.09510513.8632
EinsteiniumEs252.0829813.7879
CaliforniumCf249.07485313.7427
BerkeliumBk247.07030713.7125
CuriumCm243.06138913.6523
AmericiumAm241.05682913.6222
PlutoniumPu238.04956013.5770
NeptuniumNp236.0465713.5469
ProtactiniumPa231.0358813.4716
ThoriumTh232.0380613.4867
LutetiumLu174.966812.6291
YtterbiumYb173.05412.6003
ThuliumTm168.9342112.5384
ErbiumEr167.25912.5133
HolmiumHo164.9303212.4783
DysprosiumDy162.50012.4418

Computing molar mass step by step

First, compute the number of each atom in U7DbRfLrNoMdFmEsCfBkCmAmPuNpUPaThLuYbTmErHoDy:
U: 8, Db: 1, Rf: 1, Lr: 1, No: 1, Md: 1, Fm: 1, Es: 1, Cf: 1, Bk: 1, Cm: 1, Am: 1, Pu: 1, Np: 1, Pa: 1, Th: 1, Lu: 1, Yb: 1, Tm: 1, Er: 1, Ho: 1, Dy: 1

Then, lookup atomic weights for each element in periodic table:
U: 238.02891, Db: 268.12545, Rf: 265.1167, Lr: 262.10963, No: 259.10103, Md: 258.098431, Fm: 257.095105, Es: 252.08298, Cf: 249.0748535, Bk: 247.070307, Cm: 243.0613891, Am: 241.0568291, Pu: 238.0495599, Np: 236.04657, Pa: 231.03588, Th: 232.03806, Lu: 174.9668, Yb: 173.054, Tm: 168.93421, Er: 167.259, Ho: 164.93032, Dy: 162.5

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (U7DbRfLrNoMdFmEsCfBkCmAmPuNpUPaThLuYbTmErHoDy) = ∑ Counti * Weighti =
Count(U) * Weight(U) + Count(Db) * Weight(Db) + Count(Rf) * Weight(Rf) + Count(Lr) * Weight(Lr) + Count(No) * Weight(No) + Count(Md) * Weight(Md) + Count(Fm) * Weight(Fm) + Count(Es) * Weight(Es) + Count(Cf) * Weight(Cf) + Count(Bk) * Weight(Bk) + Count(Cm) * Weight(Cm) + Count(Am) * Weight(Am) + Count(Pu) * Weight(Pu) + Count(Np) * Weight(Np) + Count(Pa) * Weight(Pa) + Count(Th) * Weight(Th) + Count(Lu) * Weight(Lu) + Count(Yb) * Weight(Yb) + Count(Tm) * Weight(Tm) + Count(Er) * Weight(Er) + Count(Ho) * Weight(Ho) + Count(Dy) * Weight(Dy) =
8 * 238.02891 + 1 * 268.12545 + 1 * 265.1167 + 1 * 262.10963 + 1 * 259.10103 + 1 * 258.098431 + 1 * 257.095105 + 1 * 252.08298 + 1 * 249.0748535 + 1 * 247.070307 + 1 * 243.0613891 + 1 * 241.0568291 + 1 * 238.0495599 + 1 * 236.04657 + 1 * 231.03588 + 1 * 232.03806 + 1 * 174.9668 + 1 * 173.054 + 1 * 168.93421 + 1 * 167.259 + 1 * 164.93032 + 1 * 162.5 =
6655.0384 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AmBkCfCmDbDyErEsFmHoLrLuMdNoNpPaPuRfThTmU8Yb

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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