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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of (RaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)999 is 7220632.7859 g/mol

Convert between (RaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)999 weight and moles
CompoundMolesWeight, g
(RaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)999

Elemental composition of (RaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)999
ElementSymbolAtomic weightAtomsMass percent
RadiumRa226.0254109993.1271
ActiniumAc227.0277529993.1410
ThoriumTh232.038069993.2103
ProtactiniumPa231.035889993.1965
UraniumU238.028919993.2932
NeptuniumNp236.046579993.2658
PlutoniumPu238.0495609993.2935
AmericiumAm241.0568299993.3351
CuriumCm243.0613899993.3628
BerkeliumBk247.0703079993.4183
CaliforniumCf249.0748539993.4460
EinsteiniumEs252.082989993.4877
FermiumFm257.0951059993.5570
MendeleviumMd258.0984319993.5709
NobeliumNo259.10109993.5848
LawrenciumLr262.10969993.6264
RutherfordiumRf265.11679993.6680
DubniumDb268.12559993.7096
SeaborgiumSg271.13359993.7512
BohriumBh272.13809993.7651
HassiumHs270.13479993.7374
MeitneriumMt276.15129993.8206
DarmstadtiumDs281.16219993.8900
RoentgeniumRg280.16459993.8762
CoperniciumCn285.17419993.9455
NihoniumNh284.17819993.9317
FleroviumFl289.18739994.0010
MoscoviumMc288.19259993.9872

Computing molar mass step by step

First, compute the number of each atom in (RaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)999:
Ra: 999, Ac: 999, Th: 999, Pa: 999, U: 999, Np: 999, Pu: 999, Am: 999, Cm: 999, Bk: 999, Cf: 999, Es: 999, Fm: 999, Md: 999, No: 999, Lr: 999, Rf: 999, Db: 999, Sg: 999, Bh: 999, Hs: 999, Mt: 999, Ds: 999, Rg: 999, Cn: 999, Nh: 999, Fl: 999, Mc: 999

Then, lookup atomic weights for each element in periodic table:
Ra: 226.0254098, 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, Hs: 270.13465, Mt: 276.15116, Ds: 281.16206, Rg: 280.16447, Cn: 285.17411, Nh: 284.17808, Fl: 289.18728, Mc: 288.19249

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass ((RaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)999) = ∑ Counti * Weighti =
Count(Ra) * Weight(Ra) + 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(Hs) * Weight(Hs) + Count(Mt) * Weight(Mt) + Count(Ds) * Weight(Ds) + Count(Rg) * Weight(Rg) + Count(Cn) * Weight(Cn) + Count(Nh) * Weight(Nh) + Count(Fl) * Weight(Fl) + Count(Mc) * Weight(Mc) =
999 * 226.0254098 + 999 * 227.0277521 + 999 * 232.03806 + 999 * 231.03588 + 999 * 238.02891 + 999 * 236.04657 + 999 * 238.0495599 + 999 * 241.0568291 + 999 * 243.0613891 + 999 * 247.070307 + 999 * 249.0748535 + 999 * 252.08298 + 999 * 257.095105 + 999 * 258.098431 + 999 * 259.10103 + 999 * 262.10963 + 999 * 265.1167 + 999 * 268.12545 + 999 * 271.13347 + 999 * 272.13803 + 999 * 270.13465 + 999 * 276.15116 + 999 * 281.16206 + 999 * 280.16447 + 999 * 285.17411 + 999 * 284.17808 + 999 * 289.18728 + 999 * 288.19249 =
7220632.7859 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is Ac999Am999Bh999Bk999Cf999Cm999Cn999Db999Ds999Es999Fl999Fm999Hs999Lr999Mc999Md999Mt999Nh999No999Np999Pa999Pu999Ra999Rf999Rg999Sg999Th999U999

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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