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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Hs2Rg2Mt2Sg2Bh2Db2Lr2Rf2No2Md2Fm2Es2Cf2Bk2Cm2Pu2 is 8337.4144 g/mol

Convert between Hs2Rg2Mt2Sg2Bh2Db2Lr2Rf2No2Md2Fm2Es2Cf2Bk2Cm2Pu2 weight and moles
CompoundMolesWeight, g
Hs2Rg2Mt2Sg2Bh2Db2Lr2Rf2No2Md2Fm2Es2Cf2Bk2Cm2Pu2

Elemental composition of Hs2Rg2Mt2Sg2Bh2Db2Lr2Rf2No2Md2Fm2Es2Cf2Bk2Cm2Pu2
ElementSymbolAtomic weightAtomsMass percent
HassiumHs270.134726.4801
RoentgeniumRg280.164526.7207
MeitneriumMt276.151226.6244
SeaborgiumSg271.133526.5040
BohriumBh272.138026.5281
DubniumDb268.125526.4319
LawrenciumLr262.109626.2876
RutherfordiumRf265.116726.3597
NobeliumNo259.101026.2154
MendeleviumMd258.09843126.1913
FermiumFm257.09510526.1673
EinsteiniumEs252.0829826.0470
CaliforniumCf249.07485325.9749
BerkeliumBk247.07030725.9268
CuriumCm243.06138925.8306
PlutoniumPu238.04956025.7104

Computing molar mass step by step

First, compute the number of each atom in Hs2Rg2Mt2Sg2Bh2Db2Lr2Rf2No2Md2Fm2Es2Cf2Bk2Cm2Pu2:
Hs: 2, Rg: 2, Mt: 2, Sg: 2, Bh: 2, Db: 2, Lr: 2, Rf: 2, No: 2, Md: 2, Fm: 2, Es: 2, Cf: 2, Bk: 2, Cm: 2, Pu: 2

Then, lookup atomic weights for each element in periodic table:
Hs: 270.13465, Rg: 280.16447, Mt: 276.15116, Sg: 271.13347, Bh: 272.13803, Db: 268.12545, Lr: 262.10963, Rf: 265.1167, No: 259.10103, Md: 258.098431, Fm: 257.095105, Es: 252.08298, Cf: 249.0748535, Bk: 247.070307, Cm: 243.0613891, Pu: 238.0495599

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (Hs2Rg2Mt2Sg2Bh2Db2Lr2Rf2No2Md2Fm2Es2Cf2Bk2Cm2Pu2) = ∑ Counti * Weighti =
Count(Hs) * Weight(Hs) + Count(Rg) * Weight(Rg) + Count(Mt) * Weight(Mt) + Count(Sg) * Weight(Sg) + Count(Bh) * Weight(Bh) + Count(Db) * Weight(Db) + Count(Lr) * Weight(Lr) + Count(Rf) * Weight(Rf) + 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(Pu) * Weight(Pu) =
2 * 270.13465 + 2 * 280.16447 + 2 * 276.15116 + 2 * 271.13347 + 2 * 272.13803 + 2 * 268.12545 + 2 * 262.10963 + 2 * 265.1167 + 2 * 259.10103 + 2 * 258.098431 + 2 * 257.095105 + 2 * 252.08298 + 2 * 249.0748535 + 2 * 247.070307 + 2 * 243.0613891 + 2 * 238.0495599 =
8337.4144 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is Bh2Bk2Cf2Cm2Db2Es2Fm2Hs2Lr2Md2Mt2No2Pu2Rf2Rg2Sg2

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

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