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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBaBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr is 1490.5071 g/mol

Convert between HHeLiBaBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr weight and moles
CompoundMolesWeight, g
HHeLiBaBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr

Elemental composition of HHeLiBaBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0676
HeliumHe4.00260210.2685
LithiumLi6.94110.4657
BariumBa137.32719.2134
BoronB10.81110.7253
CarbonC12.010710.8058
NitrogenN14.006710.9397
OxygenO15.999411.0734
FluorineF18.998403211.2746
NeonNe20.179711.3539
SodiumNa22.9897692811.5424
MagnesiumMg24.305011.6307
AluminumAl26.981538611.8102
SiliconSi28.085511.8843
PhosphorusP30.97376212.0781
SulfurS32.06512.1513
ChlorineCl35.45312.3786
ArgonAr39.94812.6802
PotassiumK39.098312.6232
CalciumCa40.07812.6889
ScandiumSc44.95591213.0161
TitaniumTi47.86713.2115
VanadiumV50.941513.4177
ChromiumCr51.996113.4885
ManganeseMn54.93804513.6859
IronFe55.84513.7467
CobaltCo58.93319513.9539
NickelNi58.693413.9378
CopperCu63.54614.2634
ZincZn65.3814.3864
GalliumGa69.72314.6778
GermaniumGe72.6414.8735
ArsenicAs74.9216015.0266
SeleniumSe78.9615.2975
BromineBr79.90415.3609

Computing molar mass step by step

First, compute the number of each atom in HHeLiBaBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr:
H: 1, He: 1, Li: 1, Ba: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, Na: 1, Mg: 1, Al: 1, Si: 1, P: 1, S: 1, Cl: 1, Ar: 1, K: 1, Ca: 1, Sc: 1, Ti: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Co: 1, Ni: 1, Cu: 1, Zn: 1, Ga: 1, Ge: 1, As: 1, Se: 1, Br: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, Ba: 137.327, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, Ar: 39.948, K: 39.0983, Ca: 40.078, Sc: 44.955912, Ti: 47.867, V: 50.9415, Cr: 51.9961, Mn: 54.938045, Fe: 55.845, Co: 58.933195, Ni: 58.6934, Cu: 63.546, Zn: 65.38, Ga: 69.723, Ge: 72.64, As: 74.9216, Se: 78.96, Br: 79.904

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBaBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Ba) * Weight(Ba) + 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(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Sc) * Weight(Sc) + Count(Ti) * Weight(Ti) + Count(V) * Weight(V) + Count(Cr) * Weight(Cr) + Count(Mn) * Weight(Mn) + Count(Fe) * Weight(Fe) + Count(Co) * Weight(Co) + Count(Ni) * Weight(Ni) + Count(Cu) * Weight(Cu) + Count(Zn) * Weight(Zn) + Count(Ga) * Weight(Ga) + Count(Ge) * Weight(Ge) + Count(As) * Weight(As) + Count(Se) * Weight(Se) + Count(Br) * Weight(Br) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 137.327 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 1 * 39.948 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 1 * 50.9415 + 1 * 51.9961 + 1 * 54.938045 + 1 * 55.845 + 1 * 58.933195 + 1 * 58.6934 + 1 * 63.546 + 1 * 65.38 + 1 * 69.723 + 1 * 72.64 + 1 * 74.9216 + 1 * 78.96 + 1 * 79.904 =
1490.5071 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBaBrCaClCoCrCuFFeGaGeHeKLiMgMnNNaNeNiOPSScSeSiTiVZn

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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