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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of AcThPaU2NpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg is 7532.0717 g/mol

Convert between AcThPaU2NpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg weight and moles
CompoundMolesWeight, g
AcThPaU2NpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg

Elemental composition of AcThPaU2NpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg
ElementSymbolAtomic weightAtomsMass percent
ActiniumAc227.02775213.0141
ThoriumTh232.0380613.0807
ProtactiniumPa231.0358813.0674
UraniumU238.0289126.3204
NeptuniumNp236.0465713.1339
PlutoniumPu238.04956013.1605
AmericiumAm241.05682913.2004
CuriumCm243.06138913.2270
BerkeliumBk247.07030713.2802
CaliforniumCf249.07485313.3069
EinsteiniumEs252.0829813.3468
FermiumFm257.09510513.4133
MendeleviumMd258.09843113.4267
NobeliumNo259.101013.4400
LawrenciumLr262.109613.4799
RutherfordiumRf265.116713.5198
DubniumDb268.125513.5598
SeaborgiumSg271.133513.5997
BohriumBh272.138013.6131
HassiumHs270.134713.5865
MeitneriumMt276.151213.6663
DarmstadtiumDs281.162113.7329
RoentgeniumRg280.164513.7196
CoperniciumCn285.174113.7861
NihoniumNh284.178113.7729
FleroviumFl289.187313.8394
MoscoviumMc288.192513.8262
LivermoriumLv0.000000010.0000
TennessineTs292.20813.8795
OganessonOg0.000000010.0000

Computing molar mass step by step

First, compute the number of each atom in AcThPaU2NpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg:
Ac: 1, Th: 1, Pa: 1, U: 2, 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, Hs: 1, Mt: 1, Ds: 1, Rg: 1, Cn: 1, Nh: 1, Fl: 1, Mc: 1, Lv: 1, Ts: 1, Og: 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, Hs: 270.13465, Mt: 276.15116, Ds: 281.16206, Rg: 280.16447, Cn: 285.17411, Nh: 284.17808, Fl: 289.18728, Mc: 288.19249, Lv: 0, Ts: 292.20755, Og: 0

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (AcThPaU2NpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg) = ∑ 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(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) + Count(Lv) * Weight(Lv) + Count(Ts) * Weight(Ts) + Count(Og) * Weight(Og) =
1 * 227.0277521 + 1 * 232.03806 + 1 * 231.03588 + 2 * 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 * 270.13465 + 1 * 276.15116 + 1 * 281.16206 + 1 * 280.16447 + 1 * 285.17411 + 1 * 284.17808 + 1 * 289.18728 + 1 * 288.19249 + 1 * 0 + 1 * 292.20755 + 1 * 0 =
7532.0717 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAmBhBkCfCmCnDbDsEsFlFmHsLrLvMcMdMtNhNoNpOgPaPuRfRgSgThTsU2

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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