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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of AlBaCaCrAuKCoCuHgPbMgMnNaNiPtRaSnTiUWFeAgZnArBrClFPHeICNeSiN is 2832.7583 g/mol

Convert between AlBaCaCrAuKCoCuHgPbMgMnNaNiPtRaSnTiUWFeAgZnArBrClFPHeICNeSiN weight and moles
CompoundMolesWeight, g
AlBaCaCrAuKCoCuHgPbMgMnNaNiPtRaSnTiUWFeAgZnArBrClFPHeICNeSiN

Elemental composition of AlBaCaCrAuKCoCuHgPbMgMnNaNiPtRaSnTiUWFeAgZnArBrClFPHeICNeSiN
ElementSymbolAtomic weightAtomsMass percent
AluminumAl26.981538610.9525
BariumBa137.32714.8478
CalciumCa40.07811.4148
ChromiumCr51.996111.8355
GoldAu196.96656916.9532
PotassiumK39.098311.3802
CobaltCo58.93319512.0804
CopperCu63.54612.2433
MercuryHg200.5917.0811
LeadPb207.217.3144
MagnesiumMg24.305010.8580
ManganeseMn54.93804511.9394
SodiumNa22.9897692810.8116
NickelNi58.693412.0720
PlatinumPt195.08416.8867
RadiumRa226.02541017.9790
TinSn118.71014.1906
TitaniumTi47.86711.6898
UraniumU238.0289118.4027
TungstenW183.8416.4898
IronFe55.84511.9714
SilverAg107.868213.8079
ZincZn65.3812.3080
ArgonAr39.94811.4102
BromineBr79.90412.8207
ChlorineCl35.45311.2515
FluorineF18.998403210.6707
PhosphorusP30.97376211.0934
HeliumHe4.00260210.1413
IodineI126.9044714.4799
CarbonC12.010710.4240
NeonNe20.179710.7124
SiliconSi28.085510.9915
NitrogenN14.006710.4945

Computing molar mass step by step

First, compute the number of each atom in AlBaCaCrAuKCoCuHgPbMgMnNaNiPtRaSnTiUWFeAgZnArBrClFPHeICNeSiN:
Al: 1, Ba: 1, Ca: 1, Cr: 1, Au: 1, K: 1, Co: 1, Cu: 1, Hg: 1, Pb: 1, Mg: 1, Mn: 1, Na: 1, Ni: 1, Pt: 1, Ra: 1, Sn: 1, Ti: 1, U: 1, W: 1, Fe: 1, Ag: 1, Zn: 1, Ar: 1, Br: 1, Cl: 1, F: 1, P: 1, He: 1, I: 1, C: 1, Ne: 1, Si: 1, N: 1

Then, lookup atomic weights for each element in periodic table:
Al: 26.9815386, Ba: 137.327, Ca: 40.078, Cr: 51.9961, Au: 196.966569, K: 39.0983, Co: 58.933195, Cu: 63.546, Hg: 200.59, Pb: 207.2, Mg: 24.305, Mn: 54.938045, Na: 22.98976928, Ni: 58.6934, Pt: 195.084, Ra: 226.0254098, Sn: 118.71, Ti: 47.867, U: 238.02891, W: 183.84, Fe: 55.845, Ag: 107.8682, Zn: 65.38, Ar: 39.948, Br: 79.904, Cl: 35.453, F: 18.9984032, P: 30.973762, He: 4.002602, I: 126.90447, C: 12.0107, Ne: 20.1797, Si: 28.0855, N: 14.0067

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (AlBaCaCrAuKCoCuHgPbMgMnNaNiPtRaSnTiUWFeAgZnArBrClFPHeICNeSiN) = ∑ Counti * Weighti =
Count(Al) * Weight(Al) + Count(Ba) * Weight(Ba) + Count(Ca) * Weight(Ca) + Count(Cr) * Weight(Cr) + Count(Au) * Weight(Au) + Count(K) * Weight(K) + Count(Co) * Weight(Co) + Count(Cu) * Weight(Cu) + Count(Hg) * Weight(Hg) + Count(Pb) * Weight(Pb) + Count(Mg) * Weight(Mg) + Count(Mn) * Weight(Mn) + Count(Na) * Weight(Na) + Count(Ni) * Weight(Ni) + Count(Pt) * Weight(Pt) + Count(Ra) * Weight(Ra) + Count(Sn) * Weight(Sn) + Count(Ti) * Weight(Ti) + Count(U) * Weight(U) + Count(W) * Weight(W) + Count(Fe) * Weight(Fe) + Count(Ag) * Weight(Ag) + Count(Zn) * Weight(Zn) + Count(Ar) * Weight(Ar) + Count(Br) * Weight(Br) + Count(Cl) * Weight(Cl) + Count(F) * Weight(F) + Count(P) * Weight(P) + Count(He) * Weight(He) + Count(I) * Weight(I) + Count(C) * Weight(C) + Count(Ne) * Weight(Ne) + Count(Si) * Weight(Si) + Count(N) * Weight(N) =
1 * 26.9815386 + 1 * 137.327 + 1 * 40.078 + 1 * 51.9961 + 1 * 196.966569 + 1 * 39.0983 + 1 * 58.933195 + 1 * 63.546 + 1 * 200.59 + 1 * 207.2 + 1 * 24.305 + 1 * 54.938045 + 1 * 22.98976928 + 1 * 58.6934 + 1 * 195.084 + 1 * 226.0254098 + 1 * 118.71 + 1 * 47.867 + 1 * 238.02891 + 1 * 183.84 + 1 * 55.845 + 1 * 107.8682 + 1 * 65.38 + 1 * 39.948 + 1 * 79.904 + 1 * 35.453 + 1 * 18.9984032 + 1 * 30.973762 + 1 * 4.002602 + 1 * 126.90447 + 1 * 12.0107 + 1 * 20.1797 + 1 * 28.0855 + 1 * 14.0067 =
2832.7583 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CAgAlArAuBaBrCaClCoCrCuFFeHeHgIKMgMnNNaNeNiPPbPtRaSiSnTiUWZn

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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