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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeOCBNFArNaKAlSiClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVY is 2706.7729 g/mol

Convert between HHeLiBeOCBNFArNaKAlSiClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVY weight and moles
CompoundMolesWeight, g
HHeLiBeOCBNFArNaKAlSiClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVY

Elemental composition of HHeLiBeOCBNFArNaKAlSiClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVY
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0372
HeliumHe4.00260210.1479
LithiumLi6.94110.2564
BerylliumBe9.01218210.3329
OxygenO15.999410.5911
CarbonC12.010710.4437
BoronB10.81110.3994
NitrogenN14.006710.5175
FluorineF18.998403210.7019
ArgonAr39.94811.4759
SodiumNa22.9897692810.8493
PotassiumK39.098311.4445
AluminumAl26.981538610.9968
SiliconSi28.085511.0376
ChlorineCl35.45311.3098
NeonNe20.179710.7455
XenonXe131.29314.8505
KryptonKr83.79813.0959
RadiumRa226.02541018.3504
IodineI126.9044714.6884
ArsenicAs74.9216012.7679
AstatineAt209.98714817.7578
SeleniumSe78.9612.9171
PoloniumPo208.98243017.7207
PlatinumPt195.08417.2073
GoldAu196.96656917.2768
GalliumGa69.72312.5759
GermaniumGe72.6412.6836
MercuryHg200.5917.4107
LeadPb207.217.6549
IronFe55.84512.0632
CopperCu63.54612.3477
CobaltCo58.93319512.1772
VanadiumV50.941511.8820
YttriumY88.9058513.2846

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeOCBNFArNaKAlSiClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVY:
H: 1, He: 1, Li: 1, Be: 1, O: 1, C: 1, B: 1, N: 1, F: 1, Ar: 1, Na: 1, K: 1, Al: 1, Si: 1, Cl: 1, Ne: 1, Xe: 1, Kr: 1, Ra: 1, I: 1, As: 1, At: 1, Se: 1, Po: 1, Pt: 1, Au: 1, Ga: 1, Ge: 1, Hg: 1, Pb: 1, Fe: 1, Cu: 1, Co: 1, V: 1, Y: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, Be: 9.012182, O: 15.9994, C: 12.0107, B: 10.811, N: 14.0067, F: 18.9984032, Ar: 39.948, Na: 22.98976928, K: 39.0983, Al: 26.9815386, Si: 28.0855, Cl: 35.453, Ne: 20.1797, Xe: 131.293, Kr: 83.798, Ra: 226.0254098, I: 126.90447, As: 74.9216, At: 209.987148, Se: 78.96, Po: 208.9824304, Pt: 195.084, Au: 196.966569, Ga: 69.723, Ge: 72.64, Hg: 200.59, Pb: 207.2, Fe: 55.845, Cu: 63.546, Co: 58.933195, V: 50.9415, Y: 88.90585

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeOCBNFArNaKAlSiClNeXeKrRaIAsAtSePoPtAuGaGeHgPbFeCuCoVY) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(O) * Weight(O) + Count(C) * Weight(C) + Count(B) * Weight(B) + Count(N) * Weight(N) + Count(F) * Weight(F) + Count(Ar) * Weight(Ar) + Count(Na) * Weight(Na) + Count(K) * Weight(K) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(Cl) * Weight(Cl) + Count(Ne) * Weight(Ne) + Count(Xe) * Weight(Xe) + Count(Kr) * Weight(Kr) + Count(Ra) * Weight(Ra) + Count(I) * Weight(I) + Count(As) * Weight(As) + Count(At) * Weight(At) + Count(Se) * Weight(Se) + Count(Po) * Weight(Po) + Count(Pt) * Weight(Pt) + Count(Au) * Weight(Au) + Count(Ga) * Weight(Ga) + Count(Ge) * Weight(Ge) + Count(Hg) * Weight(Hg) + Count(Pb) * Weight(Pb) + Count(Fe) * Weight(Fe) + Count(Cu) * Weight(Cu) + Count(Co) * Weight(Co) + Count(V) * Weight(V) + Count(Y) * Weight(Y) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 15.9994 + 1 * 12.0107 + 1 * 10.811 + 1 * 14.0067 + 1 * 18.9984032 + 1 * 39.948 + 1 * 22.98976928 + 1 * 39.0983 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 35.453 + 1 * 20.1797 + 1 * 131.293 + 1 * 83.798 + 1 * 226.0254098 + 1 * 126.90447 + 1 * 74.9216 + 1 * 209.987148 + 1 * 78.96 + 1 * 208.9824304 + 1 * 195.084 + 1 * 196.966569 + 1 * 69.723 + 1 * 72.64 + 1 * 200.59 + 1 * 207.2 + 1 * 55.845 + 1 * 63.546 + 1 * 58.933195 + 1 * 50.9415 + 1 * 88.90585 =
2706.7729 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsAtAuBBeClCoCuFFeGaGeHeHgIKKrLiNNaNeOPbPoPtRaSeSiVXeY

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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