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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of BCFHINOPKSWUVYAcAlAmSbArAsAtBaBkBeBiBhBrCdCaCfCeCsClCrCoCuCm is 3887.2817 g/mol

Convert between BCFHINOPKSWUVYAcAlAmSbArAsAtBaBkBeBiBhBrCdCaCfCeCsClCrCoCuCm weight and moles
CompoundMolesWeight, g
BCFHINOPKSWUVYAcAlAmSbArAsAtBaBkBeBiBhBrCdCaCfCeCsClCrCoCuCm

Elemental composition of BCFHINOPKSWUVYAcAlAmSbArAsAtBaBkBeBiBhBrCdCaCfCeCsClCrCoCuCm
ElementSymbolAtomic weightAtomsMass percent
BoronB10.81110.2781
CarbonC12.010710.3090
FluorineF18.998403210.4887
HydrogenH1.0079410.0259
IodineI126.9044713.2646
NitrogenN14.006710.3603
OxygenO15.999410.4116
PhosphorusP30.97376210.7968
PotassiumK39.098311.0058
SulfurS32.06510.8249
TungstenW183.8414.7293
UraniumU238.0289116.1233
VanadiumV50.941511.3105
YttriumY88.9058512.2871
ActiniumAc227.02775215.8403
AluminumAl26.981538610.6941
AmericiumAm241.05682916.2012
AntimonySb121.76013.1323
ArgonAr39.94811.0277
ArsenicAs74.9216011.9274
AstatineAt209.98714815.4019
BariumBa137.32713.5327
BerkeliumBk247.07030716.3559
BerylliumBe9.01218210.2318
BismuthBi208.9804015.3760
BohriumBh272.138017.0007
BromineBr79.90412.0555
CadmiumCd112.41112.8918
CalciumCa40.07811.0310
CaliforniumCf249.07485316.4074
CeriumCe140.11613.6045
CesiumCs132.905451913.4190
ChlorineCl35.45310.9120
ChromiumCr51.996111.3376
CobaltCo58.93319511.5161
CopperCu63.54611.6347
CuriumCm243.06138916.2527

Computing molar mass step by step

First, compute the number of each atom in BCFHINOPKSWUVYAcAlAmSbArAsAtBaBkBeBiBhBrCdCaCfCeCsClCrCoCuCm:
B: 1, C: 1, F: 1, H: 1, I: 1, N: 1, O: 1, P: 1, K: 1, S: 1, W: 1, U: 1, V: 1, Y: 1, Ac: 1, Al: 1, Am: 1, Sb: 1, Ar: 1, As: 1, At: 1, Ba: 1, Bk: 1, Be: 1, Bi: 1, Bh: 1, Br: 1, Cd: 1, Ca: 1, Cf: 1, Ce: 1, Cs: 1, Cl: 1, Cr: 1, Co: 1, Cu: 1, Cm: 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, N: 14.0067, O: 15.9994, P: 30.973762, K: 39.0983, S: 32.065, W: 183.84, U: 238.02891, V: 50.9415, Y: 88.90585, Ac: 227.0277521, Al: 26.9815386, Am: 241.0568291, Sb: 121.76, Ar: 39.948, As: 74.9216, At: 209.987148, Ba: 137.327, Bk: 247.070307, Be: 9.012182, Bi: 208.9804, Bh: 272.13803, Br: 79.904, Cd: 112.411, Ca: 40.078, Cf: 249.0748535, Ce: 140.116, Cs: 132.9054519, Cl: 35.453, Cr: 51.9961, Co: 58.933195, Cu: 63.546, Cm: 243.0613891

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (BCFHINOPKSWUVYAcAlAmSbArAsAtBaBkBeBiBhBrCdCaCfCeCsClCrCoCuCm) = ∑ Counti * Weighti =
Count(B) * Weight(B) + Count(C) * Weight(C) + Count(F) * Weight(F) + Count(H) * Weight(H) + Count(I) * Weight(I) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(K) * Weight(K) + Count(S) * Weight(S) + Count(W) * Weight(W) + Count(U) * Weight(U) + Count(V) * Weight(V) + Count(Y) * Weight(Y) + Count(Ac) * Weight(Ac) + Count(Al) * Weight(Al) + Count(Am) * Weight(Am) + Count(Sb) * Weight(Sb) + Count(Ar) * Weight(Ar) + Count(As) * Weight(As) + Count(At) * Weight(At) + Count(Ba) * Weight(Ba) + Count(Bk) * Weight(Bk) + Count(Be) * Weight(Be) + Count(Bi) * Weight(Bi) + Count(Bh) * Weight(Bh) + Count(Br) * Weight(Br) + Count(Cd) * Weight(Cd) + Count(Ca) * Weight(Ca) + Count(Cf) * Weight(Cf) + Count(Ce) * Weight(Ce) + Count(Cs) * Weight(Cs) + Count(Cl) * Weight(Cl) + Count(Cr) * Weight(Cr) + Count(Co) * Weight(Co) + Count(Cu) * Weight(Cu) + Count(Cm) * Weight(Cm) =
1 * 10.811 + 1 * 12.0107 + 1 * 18.9984032 + 1 * 1.00794 + 1 * 126.90447 + 1 * 14.0067 + 1 * 15.9994 + 1 * 30.973762 + 1 * 39.0983 + 1 * 32.065 + 1 * 183.84 + 1 * 238.02891 + 1 * 50.9415 + 1 * 88.90585 + 1 * 227.0277521 + 1 * 26.9815386 + 1 * 241.0568291 + 1 * 121.76 + 1 * 39.948 + 1 * 74.9216 + 1 * 209.987148 + 1 * 137.327 + 1 * 247.070307 + 1 * 9.012182 + 1 * 208.9804 + 1 * 272.13803 + 1 * 79.904 + 1 * 112.411 + 1 * 40.078 + 1 * 249.0748535 + 1 * 140.116 + 1 * 132.9054519 + 1 * 35.453 + 1 * 51.9961 + 1 * 58.933195 + 1 * 63.546 + 1 * 243.0613891 =
3887.2817 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAcAlAmArAsAtBBaBeBhBiBkBrCaCdCeCfClCmCoCrCsCuFIKNOPSSbUVWY

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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