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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLiBeNaMgKCaRbSrCsBaFrRaScYLaAcTiZrHfRfVNbTaDbCrMoWSgMnTcRe is 3652.1925 g/mol

Convert between HLiBeNaMgKCaRbSrCsBaFrRaScYLaAcTiZrHfRfVNbTaDbCrMoWSgMnTcRe weight and moles
CompoundMolesWeight, g
HLiBeNaMgKCaRbSrCsBaFrRaScYLaAcTiZrHfRfVNbTaDbCrMoWSgMnTcRe

Elemental composition of HLiBeNaMgKCaRbSrCsBaFrRaScYLaAcTiZrHfRfVNbTaDbCrMoWSgMnTcRe
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0276
LithiumLi6.94110.1901
BerylliumBe9.01218210.2468
SodiumNa22.9897692810.6295
MagnesiumMg24.305010.6655
PotassiumK39.098311.0705
CalciumCa40.07811.0974
RubidiumRb85.467812.3402
StrontiumSr87.6212.3991
CesiumCs132.905451913.6391
BariumBa137.32713.7601
FranciumFr223.01973616.1065
RadiumRa226.02541016.1888
ScandiumSc44.95591211.2309
YttriumY88.9058512.4343
LanthanumLa138.9054713.8033
ActiniumAc227.02775216.2162
TitaniumTi47.86711.3106
ZirconiumZr91.22412.4978
HafniumHf178.4914.8872
RutherfordiumRf265.116717.2591
VanadiumV50.941511.3948
NiobiumNb92.9063812.5439
TantalumTa180.9478814.9545
DubniumDb268.125517.3415
ChromiumCr51.996111.4237
MolybdenumMo95.9612.6275
TungstenW183.8415.0337
SeaborgiumSg271.133517.4239
ManganeseMn54.93804511.5042
TechnetiumTc96.90636512.6534
RheniumRe186.20715.0985

Computing molar mass step by step

First, compute the number of each atom in HLiBeNaMgKCaRbSrCsBaFrRaScYLaAcTiZrHfRfVNbTaDbCrMoWSgMnTcRe:
H: 1, Li: 1, Be: 1, Na: 1, Mg: 1, K: 1, Ca: 1, Rb: 1, Sr: 1, Cs: 1, Ba: 1, Fr: 1, Ra: 1, Sc: 1, Y: 1, La: 1, Ac: 1, Ti: 1, Zr: 1, Hf: 1, Rf: 1, V: 1, Nb: 1, Ta: 1, Db: 1, Cr: 1, Mo: 1, W: 1, Sg: 1, Mn: 1, Tc: 1, Re: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, Li: 6.941, Be: 9.012182, Na: 22.98976928, Mg: 24.305, K: 39.0983, Ca: 40.078, Rb: 85.4678, Sr: 87.62, Cs: 132.9054519, Ba: 137.327, Fr: 223.0197359, Ra: 226.0254098, Sc: 44.955912, Y: 88.90585, La: 138.90547, Ac: 227.0277521, Ti: 47.867, Zr: 91.224, Hf: 178.49, Rf: 265.1167, V: 50.9415, Nb: 92.90638, Ta: 180.94788, Db: 268.12545, Cr: 51.9961, Mo: 95.96, W: 183.84, Sg: 271.13347, Mn: 54.938045, Tc: 96.906365, Re: 186.207

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HLiBeNaMgKCaRbSrCsBaFrRaScYLaAcTiZrHfRfVNbTaDbCrMoWSgMnTcRe) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Rb) * Weight(Rb) + Count(Sr) * Weight(Sr) + Count(Cs) * Weight(Cs) + Count(Ba) * Weight(Ba) + Count(Fr) * Weight(Fr) + Count(Ra) * Weight(Ra) + Count(Sc) * Weight(Sc) + Count(Y) * Weight(Y) + Count(La) * Weight(La) + Count(Ac) * Weight(Ac) + Count(Ti) * Weight(Ti) + Count(Zr) * Weight(Zr) + Count(Hf) * Weight(Hf) + Count(Rf) * Weight(Rf) + Count(V) * Weight(V) + Count(Nb) * Weight(Nb) + Count(Ta) * Weight(Ta) + Count(Db) * Weight(Db) + Count(Cr) * Weight(Cr) + Count(Mo) * Weight(Mo) + Count(W) * Weight(W) + Count(Sg) * Weight(Sg) + Count(Mn) * Weight(Mn) + Count(Tc) * Weight(Tc) + Count(Re) * Weight(Re) =
1 * 1.00794 + 1 * 6.941 + 1 * 9.012182 + 1 * 22.98976928 + 1 * 24.305 + 1 * 39.0983 + 1 * 40.078 + 1 * 85.4678 + 1 * 87.62 + 1 * 132.9054519 + 1 * 137.327 + 1 * 223.0197359 + 1 * 226.0254098 + 1 * 44.955912 + 1 * 88.90585 + 1 * 138.90547 + 1 * 227.0277521 + 1 * 47.867 + 1 * 91.224 + 1 * 178.49 + 1 * 265.1167 + 1 * 50.9415 + 1 * 92.90638 + 1 * 180.94788 + 1 * 268.12545 + 1 * 51.9961 + 1 * 95.96 + 1 * 183.84 + 1 * 271.13347 + 1 * 54.938045 + 1 * 96.906365 + 1 * 186.207 =
3652.1925 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcBaBeCaCrCsDbFrHHfKLaLiMgMnMoNaNbRaRbReRfScSgSrTaTcTiVWYZr

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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