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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H256He64Li38B25O16S8Zn4Xe2LrAtRnMdNoFmEsBkCmAm is 4525.5020 g/mol

Convert between H256He64Li38B25O16S8Zn4Xe2LrAtRnMdNoFmEsBkCmAm weight and moles
CompoundMolesWeight, g
H256He64Li38B25O16S8Zn4Xe2LrAtRnMdNoFmEsBkCmAm

Elemental composition of H256He64Li38B25O16S8Zn4Xe2LrAtRnMdNoFmEsBkCmAm
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.007942565.7017
HeliumHe4.002602645.6605
LithiumLi6.941385.8283
BoronB10.811255.9723
OxygenO15.9994165.6566
SulfurS32.06585.6683
ZincZn65.3845.7788
XenonXe131.29325.8024
LawrenciumLr262.109615.7918
AstatineAt209.98714814.6401
RadonRn210.99060114.6623
MendeleviumMd258.09843115.7032
NobeliumNo259.101015.7254
FermiumFm257.09510515.6810
EinsteiniumEs252.0829815.5703
BerkeliumBk247.07030715.4595
CuriumCm243.06138915.3709
AmericiumAm241.05682915.3266

Computing molar mass step by step

First, compute the number of each atom in H256He64Li38B25O16S8Zn4Xe2LrAtRnMdNoFmEsBkCmAm:
H: 256, He: 64, Li: 38, B: 25, O: 16, S: 8, Zn: 4, Xe: 2, Lr: 1, At: 1, Rn: 1, Md: 1, No: 1, Fm: 1, Es: 1, Bk: 1, Cm: 1, Am: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, B: 10.811, O: 15.9994, S: 32.065, Zn: 65.38, Xe: 131.293, Lr: 262.10963, At: 209.987148, Rn: 210.990601, Md: 258.098431, No: 259.10103, Fm: 257.095105, Es: 252.08298, Bk: 247.070307, Cm: 243.0613891, Am: 241.0568291

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (H256He64Li38B25O16S8Zn4Xe2LrAtRnMdNoFmEsBkCmAm) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(B) * Weight(B) + Count(O) * Weight(O) + Count(S) * Weight(S) + Count(Zn) * Weight(Zn) + Count(Xe) * Weight(Xe) + Count(Lr) * Weight(Lr) + Count(At) * Weight(At) + Count(Rn) * Weight(Rn) + Count(Md) * Weight(Md) + Count(No) * Weight(No) + Count(Fm) * Weight(Fm) + Count(Es) * Weight(Es) + Count(Bk) * Weight(Bk) + Count(Cm) * Weight(Cm) + Count(Am) * Weight(Am) =
256 * 1.00794 + 64 * 4.002602 + 38 * 6.941 + 25 * 10.811 + 16 * 15.9994 + 8 * 32.065 + 4 * 65.38 + 2 * 131.293 + 1 * 262.10963 + 1 * 209.987148 + 1 * 210.990601 + 1 * 258.098431 + 1 * 259.10103 + 1 * 257.095105 + 1 * 252.08298 + 1 * 247.070307 + 1 * 243.0613891 + 1 * 241.0568291 =
4525.5020 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AmAtB25BkCmEsFmH256He64Li38LrMdNoO16RnS8Xe2Zn4

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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