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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of (HIONFBCPSVYWUKFlCnMtDsRgHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNp) is 6364.9260 g/mol

Convert between (HIONFBCPSVYWUKFlCnMtDsRgHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNp) weight and moles
CompoundMolesWeight, g
(HIONFBCPSVYWUKFlCnMtDsRgHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNp)

Elemental composition of (HIONFBCPSVYWUKFlCnMtDsRgHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNp)
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0158
IodineI126.9044711.9938
OxygenO15.999410.2514
NitrogenN14.006710.2201
FluorineF18.998403210.2985
BoronB10.81110.1699
CarbonC12.010710.1887
PhosphorusP30.97376210.4866
SulfurS32.06510.5038
VanadiumV50.941510.8003
YttriumY88.9058511.3968
TungstenW183.8412.8883
UraniumU238.0289113.7397
PotassiumK39.098310.6143
FleroviumFl289.187314.5435
CoperniciumCn285.174114.4804
MeitneriumMt276.151214.3386
DarmstadtiumDs281.162114.4174
RoentgeniumRg280.164514.4017
HassiumHs270.134714.2441
BohriumBh272.138014.2756
SeaborgiumSg271.133514.2598
DubniumDb268.125514.2125
RutherfordiumRf265.116714.1653
LawrenciumLr262.109614.1180
NobeliumNo259.101014.0708
MendeleviumMd258.09843114.0550
FermiumFm257.09510514.0392
EinsteiniumEs252.0829813.9605
CaliforniumCf249.07485313.9132
BerkeliumBk247.07030713.8817
CuriumCm243.06138913.8188
AmericiumAm241.05682913.7873
PlutoniumPu238.04956013.7400
NeptuniumNp236.0465713.7086

Computing molar mass step by step

First, compute the number of each atom in (HIONFBCPSVYWUKFlCnMtDsRgHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNp):
H: 1, I: 1, O: 1, N: 1, F: 1, B: 1, C: 1, P: 1, S: 1, V: 1, Y: 1, W: 1, U: 1, K: 1, Fl: 1, Cn: 1, Mt: 1, Ds: 1, Rg: 1, Hs: 1, Bh: 1, Sg: 1, Db: 1, Rf: 1, Lr: 1, No: 1, Md: 1, Fm: 1, Es: 1, Cf: 1, Bk: 1, Cm: 1, Am: 1, Pu: 1, Np: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, I: 126.90447, O: 15.9994, N: 14.0067, F: 18.9984032, B: 10.811, C: 12.0107, P: 30.973762, S: 32.065, V: 50.9415, Y: 88.90585, W: 183.84, U: 238.02891, K: 39.0983, Fl: 289.18728, Cn: 285.17411, Mt: 276.15116, Ds: 281.16206, Rg: 280.16447, Hs: 270.13465, Bh: 272.13803, Sg: 271.13347, Db: 268.12545, Rf: 265.1167, Lr: 262.10963, No: 259.10103, Md: 258.098431, Fm: 257.095105, Es: 252.08298, Cf: 249.0748535, Bk: 247.070307, Cm: 243.0613891, Am: 241.0568291, Pu: 238.0495599, Np: 236.04657

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass ((HIONFBCPSVYWUKFlCnMtDsRgHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNp)) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(I) * Weight(I) + Count(O) * Weight(O) + Count(N) * Weight(N) + Count(F) * Weight(F) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(V) * Weight(V) + Count(Y) * Weight(Y) + Count(W) * Weight(W) + Count(U) * Weight(U) + Count(K) * Weight(K) + Count(Fl) * Weight(Fl) + Count(Cn) * Weight(Cn) + Count(Mt) * Weight(Mt) + Count(Ds) * Weight(Ds) + Count(Rg) * Weight(Rg) + Count(Hs) * Weight(Hs) + Count(Bh) * Weight(Bh) + Count(Sg) * Weight(Sg) + Count(Db) * Weight(Db) + Count(Rf) * Weight(Rf) + Count(Lr) * Weight(Lr) + 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(Am) * Weight(Am) + Count(Pu) * Weight(Pu) + Count(Np) * Weight(Np) =
1 * 1.00794 + 1 * 126.90447 + 1 * 15.9994 + 1 * 14.0067 + 1 * 18.9984032 + 1 * 10.811 + 1 * 12.0107 + 1 * 30.973762 + 1 * 32.065 + 1 * 50.9415 + 1 * 88.90585 + 1 * 183.84 + 1 * 238.02891 + 1 * 39.0983 + 1 * 289.18728 + 1 * 285.17411 + 1 * 276.15116 + 1 * 281.16206 + 1 * 280.16447 + 1 * 270.13465 + 1 * 272.13803 + 1 * 271.13347 + 1 * 268.12545 + 1 * 265.1167 + 1 * 262.10963 + 1 * 259.10103 + 1 * 258.098431 + 1 * 257.095105 + 1 * 252.08298 + 1 * 249.0748535 + 1 * 247.070307 + 1 * 243.0613891 + 1 * 241.0568291 + 1 * 238.0495599 + 1 * 236.04657 =
6364.9260 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPuRfRgSSgUVWY

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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