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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of AlBaCaCrAuKCoCuHgPbMgMnNaNiPt1000TiUWFeAgZnArBrClFPHeICNeSiN is 197376.9389 g/mol

Convert between AlBaCaCrAuKCoCuHgPbMgMnNaNiPt1000TiUWFeAgZnArBrClFPHeICNeSiN weight and moles
CompoundMolesWeight, g
AlBaCaCrAuKCoCuHgPbMgMnNaNiPt1000TiUWFeAgZnArBrClFPHeICNeSiN

Elemental composition of AlBaCaCrAuKCoCuHgPbMgMnNaNiPt1000TiUWFeAgZnArBrClFPHeICNeSiN
ElementSymbolAtomic weightAtomsMass percent
AluminumAl26.981538610.0137
BariumBa137.32710.0696
CalciumCa40.07810.0203
ChromiumCr51.996110.0263
GoldAu196.96656910.0998
PotassiumK39.098310.0198
CobaltCo58.93319510.0299
CopperCu63.54610.0322
MercuryHg200.5910.1016
LeadPb207.210.1050
MagnesiumMg24.305010.0123
ManganeseMn54.93804510.0278
SodiumNa22.9897692810.0116
NickelNi58.693410.0297
PlatinumPt195.084100098.8383
TitaniumTi47.86710.0243
UraniumU238.0289110.1206
TungstenW183.8410.0931
IronFe55.84510.0283
SilverAg107.868210.0547
ZincZn65.3810.0331
ArgonAr39.94810.0202
BromineBr79.90410.0405
ChlorineCl35.45310.0180
FluorineF18.998403210.0096
PhosphorusP30.97376210.0157
HeliumHe4.00260210.0020
IodineI126.9044710.0643
CarbonC12.010710.0061
NeonNe20.179710.0102
SiliconSi28.085510.0142
NitrogenN14.006710.0071

Computing molar mass step by step

First, compute the number of each atom in AlBaCaCrAuKCoCuHgPbMgMnNaNiPt1000TiUWFeAgZnArBrClFPHeICNeSiN:
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: 1000, 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, 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 (AlBaCaCrAuKCoCuHgPbMgMnNaNiPt1000TiUWFeAgZnArBrClFPHeICNeSiN) = ∑ 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(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 + 1000 * 195.084 + 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 =
197376.9389 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CAgAlArAuBaBrCaClCoCrCuFFeHeHgIKMgMnNNaNeNiPPbPt1000SiTiUWZn

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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