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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HeLiBBeCOFNCuAtSbSnRnMdLuNoNaKCaMgIBrClRuRfPtPdAuAgHgBaRaXeO is 3561.4348 g/mol

Convert between HeLiBBeCOFNCuAtSbSnRnMdLuNoNaKCaMgIBrClRuRfPtPdAuAgHgBaRaXeO weight and moles
CompoundMolesWeight, g
HeLiBBeCOFNCuAtSbSnRnMdLuNoNaKCaMgIBrClRuRfPtPdAuAgHgBaRaXeO

Elemental composition of HeLiBBeCOFNCuAtSbSnRnMdLuNoNaKCaMgIBrClRuRfPtPdAuAgHgBaRaXeO
ElementSymbolAtomic weightAtomsMass percent
HeliumHe4.00260210.1124
LithiumLi6.94110.1949
BoronB10.81110.3036
BerylliumBe9.01218210.2530
CarbonC12.010710.3372
OxygenO15.999420.8985
FluorineF18.998403210.5334
NitrogenN14.006710.3933
CopperCu63.54611.7843
AstatineAt209.98714815.8961
AntimonySb121.76013.4188
TinSn118.71013.3332
RadonRn210.99060115.9243
MendeleviumMd258.09843117.2470
LutetiumLu174.966814.9128
NobeliumNo259.101017.2752
SodiumNa22.9897692810.6455
PotassiumK39.098311.0978
CalciumCa40.07811.1253
MagnesiumMg24.305010.6824
IodineI126.9044713.5633
BromineBr79.90412.2436
ChlorineCl35.45310.9955
RutheniumRu101.0712.8379
RutherfordiumRf265.116717.4441
PlatinumPt195.08415.4777
PalladiumPd106.4212.9881
GoldAu196.96656915.5305
SilverAg107.868213.0288
MercuryHg200.5915.6323
BariumBa137.32713.8559
RadiumRa226.02541016.3465
XenonXe131.29313.6865

Computing molar mass step by step

First, compute the number of each atom in HeLiBBeCOFNCuAtSbSnRnMdLuNoNaKCaMgIBrClRuRfPtPdAuAgHgBaRaXeO:
He: 1, Li: 1, B: 1, Be: 1, C: 1, O: 2, F: 1, N: 1, Cu: 1, At: 1, Sb: 1, Sn: 1, Rn: 1, Md: 1, Lu: 1, No: 1, Na: 1, K: 1, Ca: 1, Mg: 1, I: 1, Br: 1, Cl: 1, Ru: 1, Rf: 1, Pt: 1, Pd: 1, Au: 1, Ag: 1, Hg: 1, Ba: 1, Ra: 1, Xe: 1

Then, lookup atomic weights for each element in periodic table:
He: 4.002602, Li: 6.941, B: 10.811, Be: 9.012182, C: 12.0107, O: 15.9994, F: 18.9984032, N: 14.0067, Cu: 63.546, At: 209.987148, Sb: 121.76, Sn: 118.71, Rn: 210.990601, Md: 258.098431, Lu: 174.9668, No: 259.10103, Na: 22.98976928, K: 39.0983, Ca: 40.078, Mg: 24.305, I: 126.90447, Br: 79.904, Cl: 35.453, Ru: 101.07, Rf: 265.1167, Pt: 195.084, Pd: 106.42, Au: 196.966569, Ag: 107.8682, Hg: 200.59, Ba: 137.327, Ra: 226.0254098, Xe: 131.293

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HeLiBBeCOFNCuAtSbSnRnMdLuNoNaKCaMgIBrClRuRfPtPdAuAgHgBaRaXeO) = ∑ Counti * Weighti =
Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(B) * Weight(B) + Count(Be) * Weight(Be) + Count(C) * Weight(C) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(N) * Weight(N) + Count(Cu) * Weight(Cu) + Count(At) * Weight(At) + Count(Sb) * Weight(Sb) + Count(Sn) * Weight(Sn) + Count(Rn) * Weight(Rn) + Count(Md) * Weight(Md) + Count(Lu) * Weight(Lu) + Count(No) * Weight(No) + Count(Na) * Weight(Na) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Mg) * Weight(Mg) + Count(I) * Weight(I) + Count(Br) * Weight(Br) + Count(Cl) * Weight(Cl) + Count(Ru) * Weight(Ru) + Count(Rf) * Weight(Rf) + Count(Pt) * Weight(Pt) + Count(Pd) * Weight(Pd) + Count(Au) * Weight(Au) + Count(Ag) * Weight(Ag) + Count(Hg) * Weight(Hg) + Count(Ba) * Weight(Ba) + Count(Ra) * Weight(Ra) + Count(Xe) * Weight(Xe) =
1 * 4.002602 + 1 * 6.941 + 1 * 10.811 + 1 * 9.012182 + 1 * 12.0107 + 2 * 15.9994 + 1 * 18.9984032 + 1 * 14.0067 + 1 * 63.546 + 1 * 209.987148 + 1 * 121.76 + 1 * 118.71 + 1 * 210.990601 + 1 * 258.098431 + 1 * 174.9668 + 1 * 259.10103 + 1 * 22.98976928 + 1 * 39.0983 + 1 * 40.078 + 1 * 24.305 + 1 * 126.90447 + 1 * 79.904 + 1 * 35.453 + 1 * 101.07 + 1 * 265.1167 + 1 * 195.084 + 1 * 106.42 + 1 * 196.966569 + 1 * 107.8682 + 1 * 200.59 + 1 * 137.327 + 1 * 226.0254098 + 1 * 131.293 =
3561.4348 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CAgAtAuBBaBeBrCaClCuFHeHgIKLiLuMdMgNNaNoO2PdPtRaRfRnRuSbSnXe

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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