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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLiBeBCNOFNaMgAlSiPSClKCaBaZnFeSnPbCuHgAgPtAuMnWBrINhFlMcTs is 3316.6859 g/mol

Convert between HLiBeBCNOFNaMgAlSiPSClKCaBaZnFeSnPbCuHgAgPtAuMnWBrINhFlMcTs weight and moles
CompoundMolesWeight, g
HLiBeBCNOFNaMgAlSiPSClKCaBaZnFeSnPbCuHgAgPtAuMnWBrINhFlMcTs

Elemental composition of HLiBeBCNOFNaMgAlSiPSClKCaBaZnFeSnPbCuHgAgPtAuMnWBrINhFlMcTs
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0304
LithiumLi6.94110.2093
BerylliumBe9.01218210.2717
BoronB10.81110.3260
CarbonC12.010710.3621
NitrogenN14.006710.4223
OxygenO15.999410.4824
FluorineF18.998403210.5728
SodiumNa22.9897692810.6932
MagnesiumMg24.305010.7328
AluminumAl26.981538610.8135
SiliconSi28.085510.8468
PhosphorusP30.97376210.9339
SulfurS32.06510.9668
ChlorineCl35.45311.0689
PotassiumK39.098311.1788
CalciumCa40.07811.2084
BariumBa137.32714.1405
ZincZn65.3811.9712
IronFe55.84511.6838
TinSn118.71013.5792
LeadPb207.216.2472
CopperCu63.54611.9159
MercuryHg200.5916.0479
SilverAg107.868213.2523
PlatinumPt195.08415.8819
GoldAu196.96656915.9387
ManganeseMn54.93804511.6564
TungstenW183.8415.5429
BromineBr79.90412.4092
IodineI126.9044713.8262
NihoniumNh284.178118.5681
FleroviumFl289.187318.7192
MoscoviumMc288.192518.6892
TennessineTs292.20818.8102

Computing molar mass step by step

First, compute the number of each atom in HLiBeBCNOFNaMgAlSiPSClKCaBaZnFeSnPbCuHgAgPtAuMnWBrINhFlMcTs:
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, Ba: 1, Zn: 1, Fe: 1, Sn: 1, Pb: 1, Cu: 1, Hg: 1, Ag: 1, Pt: 1, Au: 1, Mn: 1, W: 1, Br: 1, I: 1, Nh: 1, Fl: 1, Mc: 1, Ts: 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, Ba: 137.327, Zn: 65.38, Fe: 55.845, Sn: 118.71, Pb: 207.2, Cu: 63.546, Hg: 200.59, Ag: 107.8682, Pt: 195.084, Au: 196.966569, Mn: 54.938045, W: 183.84, Br: 79.904, I: 126.90447, Nh: 284.17808, Fl: 289.18728, Mc: 288.19249, Ts: 292.20755

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HLiBeBCNOFNaMgAlSiPSClKCaBaZnFeSnPbCuHgAgPtAuMnWBrINhFlMcTs) = ∑ 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(Ba) * Weight(Ba) + Count(Zn) * Weight(Zn) + Count(Fe) * Weight(Fe) + Count(Sn) * Weight(Sn) + Count(Pb) * Weight(Pb) + Count(Cu) * Weight(Cu) + Count(Hg) * Weight(Hg) + Count(Ag) * Weight(Ag) + Count(Pt) * Weight(Pt) + Count(Au) * Weight(Au) + Count(Mn) * Weight(Mn) + Count(W) * Weight(W) + Count(Br) * Weight(Br) + Count(I) * Weight(I) + Count(Nh) * Weight(Nh) + Count(Fl) * Weight(Fl) + Count(Mc) * Weight(Mc) + Count(Ts) * Weight(Ts) =
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 * 137.327 + 1 * 65.38 + 1 * 55.845 + 1 * 118.71 + 1 * 207.2 + 1 * 63.546 + 1 * 200.59 + 1 * 107.8682 + 1 * 195.084 + 1 * 196.966569 + 1 * 54.938045 + 1 * 183.84 + 1 * 79.904 + 1 * 126.90447 + 1 * 284.17808 + 1 * 289.18728 + 1 * 288.19249 + 1 * 292.20755 =
3316.6859 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAlAuBBaBeBrCaClCuFFeFlHgIKLiMcMgMnNNaNhOPPbPtSSiSnTsWZn

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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