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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of (UPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)9999999999999 is 60756869745993920.0000 g/mol

Convert between (UPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)9999999999999 weight and moles
CompoundMolesWeight, g
(UPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)9999999999999

Elemental composition of (UPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)9999999999999
ElementSymbolAtomic weightAtomsMass percent
UraniumU238.0289199999999999993.9177
PlutoniumPu238.04956099999999999993.9181
AmericiumAm241.05682999999999999993.9676
CuriumCm243.06138999999999999994.0006
BerkeliumBk247.07030799999999999994.0665
CaliforniumCf249.07485399999999999994.0995
EinsteiniumEs252.0829899999999999994.1490
FermiumFm257.09510599999999999994.2315
MendeleviumMd258.09843199999999999994.2481
NobeliumNo259.101099999999999994.2646
LawrenciumLr262.109699999999999994.3141
RutherfordiumRf265.116799999999999994.3636
DubniumDb268.125599999999999994.4131
SeaborgiumSg271.133599999999999994.4626
BohriumBh272.138099999999999994.4791
HassiumHs270.134799999999999994.4462
MeitneriumMt276.151299999999999994.5452
DarmstadtiumDs281.162199999999999994.6277
RoentgeniumRg280.164599999999999994.6112
CoperniciumCn285.174199999999999994.6937
NihoniumNh284.178199999999999994.6773
FleroviumFl289.187399999999999994.7597
MoscoviumMc288.192599999999999994.7434

Computing molar mass step by step

First, compute the number of each atom in (UPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)9999999999999:
U: 9999999999999, Pu: 9999999999999, Am: 9999999999999, Cm: 9999999999999, Bk: 9999999999999, Cf: 9999999999999, Es: 9999999999999, Fm: 9999999999999, Md: 9999999999999, No: 9999999999999, Lr: 9999999999999, Rf: 9999999999999, Db: 9999999999999, Sg: 9999999999999, Bh: 9999999999999, Hs: 9999999999999, Mt: 9999999999999, Ds: 9999999999999, Rg: 9999999999999, Cn: 9999999999999, Nh: 9999999999999, Fl: 9999999999999, Mc: 9999999999999

Then, lookup atomic weights for each element in periodic table:
U: 238.02891, 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 ((UPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMc)9999999999999) = ∑ Counti * Weighti =
Count(U) * Weight(U) + 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) =
9999999999999 * 238.02891 + 9999999999999 * 238.0495599 + 9999999999999 * 241.0568291 + 9999999999999 * 243.0613891 + 9999999999999 * 247.070307 + 9999999999999 * 249.0748535 + 9999999999999 * 252.08298 + 9999999999999 * 257.095105 + 9999999999999 * 258.098431 + 9999999999999 * 259.10103 + 9999999999999 * 262.10963 + 9999999999999 * 265.1167 + 9999999999999 * 268.12545 + 9999999999999 * 271.13347 + 9999999999999 * 272.13803 + 9999999999999 * 270.13465 + 9999999999999 * 276.15116 + 9999999999999 * 281.16206 + 9999999999999 * 280.16447 + 9999999999999 * 285.17411 + 9999999999999 * 284.17808 + 9999999999999 * 289.18728 + 9999999999999 * 288.19249 =
60756869745993920.0000 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is Am9999999999999Bh9999999999999Bk9999999999999Cf9999999999999Cm9999999999999Cn9999999999999Db9999999999999Ds9999999999999Es9999999999999Fl9999999999999Fm9999999999999Hs9999999999999Lr9999999999999Mc9999999999999Md9999999999999Mt9999999999999Nh9999999999999No9999999999999Pu9999999999999Rf9999999999999Rg9999999999999Sg9999999999999U9999999999999

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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