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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHfCrSrZrAr is 3706.9285 g/mol

Convert between BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHfCrSrZrAr weight and moles
CompoundMolesWeight, g
BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHfCrSrZrAr

Elemental composition of BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHfCrSrZrAr
ElementSymbolAtomic weightAtomsMass percent
BoronB10.81110.2916
CarbonC12.010710.3240
FluorineF18.998403210.5125
HydrogenH1.0079410.0272
IodineI126.9044713.4234
PotassiumK39.098311.0547
NitrogenN14.006710.3779
OxygenO15.999410.4316
PhosphorusP30.97376210.8356
SulfurS32.06510.8650
UraniumU238.0289116.4212
VanadiumV50.941511.3742
TungstenW183.8414.9594
YttriumY88.9058512.3984
IndiumIn114.81813.0974
IridiumIr192.21715.1853
ChlorineCl35.45310.9564
ThalliumTl204.383315.5135
NickelNi58.693411.5833
AluminumAl26.981538610.7279
TitaniumTi47.86711.2913
LithiumLi6.94110.1872
SiliconSi28.085510.7576
RutherfordiumRf265.116717.1519
CaliforniumCf249.07485316.7192
LeadPb207.215.5895
RubidiumRb85.467812.3056
NiobiumNb92.9063812.5063
AntimonySb121.76013.2847
BismuthBi208.9804015.6376
FleroviumFl289.187317.8013
TerbiumTb158.9253514.2873
HafniumHf178.4914.8150
ChromiumCr51.996111.4027
StrontiumSr87.6212.3637
ZirconiumZr91.22412.4609
ArgonAr39.94811.0777

Computing molar mass step by step

First, compute the number of each atom in BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHfCrSrZrAr:
B: 1, C: 1, F: 1, H: 1, I: 1, K: 1, N: 1, O: 1, P: 1, S: 1, U: 1, V: 1, W: 1, Y: 1, In: 1, Ir: 1, Cl: 1, Tl: 1, Ni: 1, Al: 1, Ti: 1, Li: 1, Si: 1, Rf: 1, Cf: 1, Pb: 1, Rb: 1, Nb: 1, Sb: 1, Bi: 1, Fl: 1, Tb: 1, Hf: 1, Cr: 1, Sr: 1, Zr: 1, Ar: 1

Then, lookup atomic weights for each element in periodic table:
B: 10.811, C: 12.0107, F: 18.9984032, H: 1.00794, I: 126.90447, K: 39.0983, N: 14.0067, O: 15.9994, P: 30.973762, S: 32.065, U: 238.02891, V: 50.9415, W: 183.84, Y: 88.90585, In: 114.818, Ir: 192.217, Cl: 35.453, Tl: 204.3833, Ni: 58.6934, Al: 26.9815386, Ti: 47.867, Li: 6.941, Si: 28.0855, Rf: 265.1167, Cf: 249.0748535, Pb: 207.2, Rb: 85.4678, Nb: 92.90638, Sb: 121.76, Bi: 208.9804, Fl: 289.18728, Tb: 158.92535, Hf: 178.49, Cr: 51.9961, Sr: 87.62, Zr: 91.224, Ar: 39.948

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHfCrSrZrAr) = ∑ Counti * Weighti =
Count(B) * Weight(B) + Count(C) * Weight(C) + Count(F) * Weight(F) + Count(H) * Weight(H) + Count(I) * Weight(I) + Count(K) * Weight(K) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(U) * Weight(U) + Count(V) * Weight(V) + Count(W) * Weight(W) + Count(Y) * Weight(Y) + Count(In) * Weight(In) + Count(Ir) * Weight(Ir) + Count(Cl) * Weight(Cl) + Count(Tl) * Weight(Tl) + Count(Ni) * Weight(Ni) + Count(Al) * Weight(Al) + Count(Ti) * Weight(Ti) + Count(Li) * Weight(Li) + Count(Si) * Weight(Si) + Count(Rf) * Weight(Rf) + Count(Cf) * Weight(Cf) + Count(Pb) * Weight(Pb) + Count(Rb) * Weight(Rb) + Count(Nb) * Weight(Nb) + Count(Sb) * Weight(Sb) + Count(Bi) * Weight(Bi) + Count(Fl) * Weight(Fl) + Count(Tb) * Weight(Tb) + Count(Hf) * Weight(Hf) + Count(Cr) * Weight(Cr) + Count(Sr) * Weight(Sr) + Count(Zr) * Weight(Zr) + Count(Ar) * Weight(Ar) =
1 * 10.811 + 1 * 12.0107 + 1 * 18.9984032 + 1 * 1.00794 + 1 * 126.90447 + 1 * 39.0983 + 1 * 14.0067 + 1 * 15.9994 + 1 * 30.973762 + 1 * 32.065 + 1 * 238.02891 + 1 * 50.9415 + 1 * 183.84 + 1 * 88.90585 + 1 * 114.818 + 1 * 192.217 + 1 * 35.453 + 1 * 204.3833 + 1 * 58.6934 + 1 * 26.9815386 + 1 * 47.867 + 1 * 6.941 + 1 * 28.0855 + 1 * 265.1167 + 1 * 249.0748535 + 1 * 207.2 + 1 * 85.4678 + 1 * 92.90638 + 1 * 121.76 + 1 * 208.9804 + 1 * 289.18728 + 1 * 158.92535 + 1 * 178.49 + 1 * 51.9961 + 1 * 87.62 + 1 * 91.224 + 1 * 39.948 =
3706.9285 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArBBiCfClCrFFlHfIInIrKLiNNbNiOPPbRbRfSSbSiSrTbTiTlUVWYZr

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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