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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of SiHONUuoAuNoLiRbFCsFrMgBeScVRhYLaAcZnMnCrHfHsHoAmUusUuhUupUuqUutUub is 4135.3242 g/mol

Convert between SiHONUuoAuNoLiRbFCsFrMgBeScVRhYLaAcZnMnCrHfHsHoAmUusUuhUupUuqUutUub weight and moles
CompoundMolesWeight, g
SiHONUuoAuNoLiRbFCsFrMgBeScVRhYLaAcZnMnCrHfHsHoAmUusUuhUupUuqUutUub

Elemental composition of SiHONUuoAuNoLiRbFCsFrMgBeScVRhYLaAcZnMnCrHfHsHoAmUusUuhUupUuqUutUub
ElementSymbolAtomic weightAtomsMass percent
SiliconSi28.085510.6792
HydrogenH1.0079410.0244
OxygenO15.999410.3869
NitrogenN14.006710.3387
OganessonUuo0.000000010.0000
GoldAu196.96656914.7630
NobeliumNo259.101016.2656
LithiumLi6.94110.1678
RubidiumRb85.467812.0668
FluorineF18.998403210.4594
CesiumCs132.905451913.2139
FranciumFr223.01973615.3930
MagnesiumMg24.305010.5877
BerylliumBe9.01218210.2179
ScandiumSc44.95591211.0871
VanadiumV50.941511.2319
RhodiumRh102.9055012.4885
YttriumY88.9058512.1499
LanthanumLa138.9054713.3590
ActiniumAc227.02775215.4900
ZincZn65.3811.5810
ManganeseMn54.93804511.3285
ChromiumCr51.996111.2574
HafniumHf178.4914.3162
HassiumHs270.134716.5324
HolmiumHo164.9303213.9883
AmericiumAm241.05682915.8292
TennessineUus292.20817.0661
LivermoriumUuh0.000000010.0000
MoscoviumUup288.192516.9690
FleroviumUuq289.187316.9931
NihoniumUut284.178116.8720
CoperniciumUub285.174116.8961

Computing molar mass step by step

First, compute the number of each atom in SiHONUuoAuNoLiRbFCsFrMgBeScVRhYLaAcZnMnCrHfHsHoAmUusUuhUupUuqUutUub:
Si: 1, H: 1, O: 1, N: 1, Uuo: 1, Au: 1, No: 1, Li: 1, Rb: 1, F: 1, Cs: 1, Fr: 1, Mg: 1, Be: 1, Sc: 1, V: 1, Rh: 1, Y: 1, La: 1, Ac: 1, Zn: 1, Mn: 1, Cr: 1, Hf: 1, Hs: 1, Ho: 1, Am: 1, Uus: 1, Uuh: 1, Uup: 1, Uuq: 1, Uut: 1, Uub: 1

Then, lookup atomic weights for each element in periodic table:
Si: 28.0855, H: 1.00794, O: 15.9994, N: 14.0067, Uuo: 0, Au: 196.966569, No: 259.10103, Li: 6.941, Rb: 85.4678, F: 18.9984032, Cs: 132.9054519, Fr: 223.0197359, Mg: 24.305, Be: 9.012182, Sc: 44.955912, V: 50.9415, Rh: 102.9055, Y: 88.90585, La: 138.90547, Ac: 227.0277521, Zn: 65.38, Mn: 54.938045, Cr: 51.9961, Hf: 178.49, Hs: 270.13465, Ho: 164.93032, Am: 241.0568291, Uus: 292.20755, Uuh: 0, Uup: 288.19249, Uuq: 289.18728, Uut: 284.17808, Uub: 285.17411

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (SiHONUuoAuNoLiRbFCsFrMgBeScVRhYLaAcZnMnCrHfHsHoAmUusUuhUupUuqUutUub) = ∑ Counti * Weighti =
Count(Si) * Weight(Si) + Count(H) * Weight(H) + Count(O) * Weight(O) + Count(N) * Weight(N) + Count(Uuo) * Weight(Uuo) + Count(Au) * Weight(Au) + Count(No) * Weight(No) + Count(Li) * Weight(Li) + Count(Rb) * Weight(Rb) + Count(F) * Weight(F) + Count(Cs) * Weight(Cs) + Count(Fr) * Weight(Fr) + Count(Mg) * Weight(Mg) + Count(Be) * Weight(Be) + Count(Sc) * Weight(Sc) + Count(V) * Weight(V) + Count(Rh) * Weight(Rh) + Count(Y) * Weight(Y) + Count(La) * Weight(La) + Count(Ac) * Weight(Ac) + Count(Zn) * Weight(Zn) + Count(Mn) * Weight(Mn) + Count(Cr) * Weight(Cr) + Count(Hf) * Weight(Hf) + Count(Hs) * Weight(Hs) + Count(Ho) * Weight(Ho) + Count(Am) * Weight(Am) + Count(Uus) * Weight(Uus) + Count(Uuh) * Weight(Uuh) + Count(Uup) * Weight(Uup) + Count(Uuq) * Weight(Uuq) + Count(Uut) * Weight(Uut) + Count(Uub) * Weight(Uub) =
1 * 28.0855 + 1 * 1.00794 + 1 * 15.9994 + 1 * 14.0067 + 1 * 0 + 1 * 196.966569 + 1 * 259.10103 + 1 * 6.941 + 1 * 85.4678 + 1 * 18.9984032 + 1 * 132.9054519 + 1 * 223.0197359 + 1 * 24.305 + 1 * 9.012182 + 1 * 44.955912 + 1 * 50.9415 + 1 * 102.9055 + 1 * 88.90585 + 1 * 138.90547 + 1 * 227.0277521 + 1 * 65.38 + 1 * 54.938045 + 1 * 51.9961 + 1 * 178.49 + 1 * 270.13465 + 1 * 164.93032 + 1 * 241.0568291 + 1 * 292.20755 + 1 * 0 + 1 * 288.19249 + 1 * 289.18728 + 1 * 284.17808 + 1 * 285.17411 =
4135.3242 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAmAuBeCrCsFFrHHfHoHsLaLiMgMnNNoORbRhScSiUubUuhUuoUupUuqUusUutVYZn

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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