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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrRbSrY is 1560.0556 g/mol

Convert between HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrRbSrY weight and moles
CompoundMolesWeight, g
HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrRbSrY

Elemental composition of HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrRbSrY
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0646
LithiumLi6.94110.4449
BerylliumBe9.01218210.5777
BoronB10.81110.6930
CarbonC12.010710.7699
NitrogenN14.006710.8978
OxygenO15.999411.0256
FluorineF18.998403211.2178
SodiumNa22.9897692811.4737
MagnesiumMg24.305011.5580
AluminumAl26.981538611.7295
SiliconSi28.085511.8003
PhosphorusP30.97376211.9854
SulfurS32.06512.0554
ChlorineCl35.45312.2725
PotassiumK39.098312.5062
CalciumCa40.07812.5690
ScandiumSc44.95591212.8817
TitaniumTi47.86713.0683
VanadiumV50.941513.2654
ChromiumCr51.996113.3330
ManganeseMn54.93804513.5215
IronFe55.84513.5797
CobaltCo58.93319513.7776
NickelNi58.693413.7623
CopperCu63.54614.0733
ZincZn65.3814.1909
GalliumGa69.72314.4693
GermaniumGe72.6414.6562
ArsenicAs74.9216014.8025
SeleniumSe78.9615.0614
BromineBr79.90415.1219
RubidiumRb85.467815.4785
StrontiumSr87.6215.6165
YttriumY88.9058515.6989

Computing molar mass step by step

First, compute the number of each atom in HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrRbSrY:
H: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Na: 1, Mg: 1, Al: 1, Si: 1, P: 1, S: 1, Cl: 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, Rb: 1, Sr: 1, Y: 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, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, 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, Rb: 85.4678, Sr: 87.62, Y: 88.90585

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrRbSrY) = ∑ 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(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(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) + Count(Rb) * Weight(Rb) + Count(Sr) * Weight(Sr) + Count(Y) * Weight(Y) =
1 * 1.00794 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 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 + 1 * 85.4678 + 1 * 87.62 + 1 * 88.90585 =
1560.0556 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlAsBBeBrCaClCoCrCuFFeGaGeKLiMgMnNNaNiOPRbSScSeSiSrTiVYZn

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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