Printed from https://www.webqc.org

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLiBeBCNOFNeHeNaKRbCsFrMgCaSrBaRaScYLaAcTiZrHfTaNbVCrMnTcReO is 2680.0247 g/mol

Convert between HLiBeBCNOFNeHeNaKRbCsFrMgCaSrBaRaScYLaAcTiZrHfTaNbVCrMnTcReO weight and moles
CompoundMolesWeight, g
HLiBeBCNOFNeHeNaKRbCsFrMgCaSrBaRaScYLaAcTiZrHfTaNbVCrMnTcReO

Elemental composition of HLiBeBCNOFNeHeNaKRbCsFrMgCaSrBaRaScYLaAcTiZrHfTaNbVCrMnTcReO
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0376
LithiumLi6.94110.2590
BerylliumBe9.01218210.3363
BoronB10.81110.4034
CarbonC12.010710.4482
NitrogenN14.006710.5226
OxygenO15.999421.1940
FluorineF18.998403210.7089
NeonNe20.179710.7530
HeliumHe4.00260210.1493
SodiumNa22.9897692810.8578
PotassiumK39.098311.4589
RubidiumRb85.467813.1891
CesiumCs132.905451914.9591
FranciumFr223.01973618.3216
MagnesiumMg24.305010.9069
CalciumCa40.07811.4954
StrontiumSr87.6213.2694
BariumBa137.32715.1241
RadiumRa226.02541018.4337
ScandiumSc44.95591211.6774
YttriumY88.9058513.3174
LanthanumLa138.9054715.1830
ActiniumAc227.02775218.4711
TitaniumTi47.86711.7861
ZirconiumZr91.22413.4038
HafniumHf178.4916.6600
TantalumTa180.9478816.7517
NiobiumNb92.9063813.4666
VanadiumV50.941511.9008
ChromiumCr51.996111.9401
ManganeseMn54.93804512.0499
TechnetiumTc96.90636513.6159
RheniumRe186.20716.9480

Computing molar mass step by step

First, compute the number of each atom in HLiBeBCNOFNeHeNaKRbCsFrMgCaSrBaRaScYLaAcTiZrHfTaNbVCrMnTcReO:
H: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 2, F: 1, Ne: 1, He: 1, Na: 1, K: 1, Rb: 1, Cs: 1, Fr: 1, Mg: 1, Ca: 1, Sr: 1, Ba: 1, Ra: 1, Sc: 1, Y: 1, La: 1, Ac: 1, Ti: 1, Zr: 1, Hf: 1, Ta: 1, Nb: 1, V: 1, Cr: 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, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, He: 4.002602, Na: 22.98976928, K: 39.0983, Rb: 85.4678, Cs: 132.9054519, Fr: 223.0197359, Mg: 24.305, Ca: 40.078, Sr: 87.62, Ba: 137.327, Ra: 226.0254098, Sc: 44.955912, Y: 88.90585, La: 138.90547, Ac: 227.0277521, Ti: 47.867, Zr: 91.224, Hf: 178.49, Ta: 180.94788, Nb: 92.90638, V: 50.9415, Cr: 51.9961, 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 (HLiBeBCNOFNeHeNaKRbCsFrMgCaSrBaRaScYLaAcTiZrHfTaNbVCrMnTcReO) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(He) * Weight(He) + Count(Na) * Weight(Na) + Count(K) * Weight(K) + Count(Rb) * Weight(Rb) + Count(Cs) * Weight(Cs) + Count(Fr) * Weight(Fr) + Count(Mg) * Weight(Mg) + Count(Ca) * Weight(Ca) + Count(Sr) * Weight(Sr) + Count(Ba) * Weight(Ba) + 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(Ta) * Weight(Ta) + Count(Nb) * Weight(Nb) + Count(V) * Weight(V) + Count(Cr) * Weight(Cr) + Count(Mn) * Weight(Mn) + Count(Tc) * Weight(Tc) + Count(Re) * Weight(Re) =
1 * 1.00794 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 2 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 4.002602 + 1 * 22.98976928 + 1 * 39.0983 + 1 * 85.4678 + 1 * 132.9054519 + 1 * 223.0197359 + 1 * 24.305 + 1 * 40.078 + 1 * 87.62 + 1 * 137.327 + 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 * 180.94788 + 1 * 92.90638 + 1 * 50.9415 + 1 * 51.9961 + 1 * 54.938045 + 1 * 96.906365 + 1 * 186.207 =
2680.0247 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAcBBaBeCaCrCsFFrHeHfKLaLiMgMnNNaNbNeO2RaRbReScSrTaTcTiVYZr

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
Please let us know how we can improve this web app.
Menu Balance Molar mass Gas laws Units Chemistry tools Periodic table Chemical forum Symmetry Constants Contribute Contact us
How to cite?
Choose languageDeutschEnglishEspañolFrançaisItalianoNederlandsPolskiPortuguêsРусский中文日本語한국어