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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHf is 3436.1404 g/mol

Convert between BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHf weight and moles
CompoundMolesWeight, g
BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHf

Elemental composition of BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHf
ElementSymbolAtomic weightAtomsMass percent
BoronB10.81110.3146
CarbonC12.010710.3495
FluorineF18.998403210.5529
HydrogenH1.0079410.0293
IodineI126.9044713.6932
PotassiumK39.098311.1379
NitrogenN14.006710.4076
OxygenO15.999410.4656
PhosphorusP30.97376210.9014
SulfurS32.06510.9332
UraniumU238.0289116.9272
VanadiumV50.941511.4825
TungstenW183.8415.3502
YttriumY88.9058512.5874
IndiumIn114.81813.3415
IridiumIr192.21715.5940
ChlorineCl35.45311.0318
ThalliumTl204.383315.9480
NickelNi58.693411.7081
AluminumAl26.981538610.7852
TitaniumTi47.86711.3930
LithiumLi6.94110.2020
SiliconSi28.085510.8174
RutherfordiumRf265.116717.7155
CaliforniumCf249.07485317.2487
LeadPb207.216.0300
RubidiumRb85.467812.4873
NiobiumNb92.9063812.7038
AntimonySb121.76013.5435
BismuthBi208.9804016.0818
FleroviumFl289.187318.4160
TerbiumTb158.9253514.6251
HafniumHf178.4915.1945

Computing molar mass step by step

First, compute the number of each atom in BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHf:
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

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

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (BCFHIKNOPSUVWYInIrClTlNiAlTiLiSiRfCfPbRbNbSbBiFlTbHf) = ∑ 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) =
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 =
3436.1404 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlBBiCfClFFlHfIInIrKLiNNbNiOPPbRbRfSSbSiTbTiTlUVWY

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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