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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWY is 6595.9619 g/mol

Convert between CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWY weight and moles
CompoundMolesWeight, g
CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWY

Elemental composition of CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWY
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.010710.1821
HydrogenH1.0079410.0153
AmericiumAm241.05682913.6546
BoronB10.81110.1639
BohriumBh272.138014.1258
BerkeliumBk247.07030713.7458
CaliforniumCf249.07485313.7762
CuriumCm243.06138913.6850
CoperniciumCn285.174114.3235
DubniumDb268.125514.0650
DarmstadtiumDs281.162114.2626
EinsteiniumEs252.0829813.8218
FluorineF18.998403210.2880
FleroviumFl289.187314.3843
FermiumFm257.09510513.8978
HassiumHs270.134714.0955
IodineI126.9044711.9240
PotassiumK39.098310.5928
LawrenciumLr262.109613.9738
MendeleviumMd258.09843113.9130
MeitneriumMt276.151214.1867
NitrogenN14.006710.2124
NobeliumNo259.101013.9282
NeptuniumNp236.0465713.5787
OxygenO15.999410.2426
PhosphorusP30.97376210.4696
ProtactiniumPa231.0358813.5027
PlutoniumPu238.04956013.6090
RutherfordiumRf265.116714.0194
RoentgeniumRg280.164514.2475
SulfurS32.06510.4861
SeaborgiumSg271.133514.1106
UraniumU238.0289113.6087
VanadiumV50.941510.7723
TungstenW183.8412.7872
YttriumY88.9058511.3479

Computing molar mass step by step

First, compute the number of each atom in CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWY:
C: 1, H: 1, Am: 1, B: 1, Bh: 1, Bk: 1, Cf: 1, Cm: 1, Cn: 1, Db: 1, Ds: 1, Es: 1, F: 1, Fl: 1, Fm: 1, Hs: 1, I: 1, K: 1, Lr: 1, Md: 1, Mt: 1, N: 1, No: 1, Np: 1, O: 1, P: 1, Pa: 1, Pu: 1, Rf: 1, Rg: 1, S: 1, Sg: 1, U: 1, V: 1, W: 1, Y: 1

Then, lookup atomic weights for each element in periodic table:
C: 12.0107, H: 1.00794, Am: 241.0568291, B: 10.811, Bh: 272.13803, Bk: 247.070307, Cf: 249.0748535, Cm: 243.0613891, Cn: 285.17411, Db: 268.12545, Ds: 281.16206, Es: 252.08298, F: 18.9984032, Fl: 289.18728, Fm: 257.095105, Hs: 270.13465, I: 126.90447, K: 39.0983, Lr: 262.10963, Md: 258.098431, Mt: 276.15116, N: 14.0067, No: 259.10103, Np: 236.04657, O: 15.9994, P: 30.973762, Pa: 231.03588, Pu: 238.0495599, Rf: 265.1167, Rg: 280.16447, S: 32.065, Sg: 271.13347, U: 238.02891, V: 50.9415, W: 183.84, Y: 88.90585

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWY) = ∑ Counti * Weighti =
Count(C) * Weight(C) + Count(H) * Weight(H) + Count(Am) * Weight(Am) + Count(B) * Weight(B) + Count(Bh) * Weight(Bh) + Count(Bk) * Weight(Bk) + Count(Cf) * Weight(Cf) + Count(Cm) * Weight(Cm) + Count(Cn) * Weight(Cn) + Count(Db) * Weight(Db) + Count(Ds) * Weight(Ds) + Count(Es) * Weight(Es) + Count(F) * Weight(F) + Count(Fl) * Weight(Fl) + Count(Fm) * Weight(Fm) + Count(Hs) * Weight(Hs) + Count(I) * Weight(I) + Count(K) * Weight(K) + Count(Lr) * Weight(Lr) + Count(Md) * Weight(Md) + Count(Mt) * Weight(Mt) + Count(N) * Weight(N) + Count(No) * Weight(No) + Count(Np) * Weight(Np) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(Pa) * Weight(Pa) + Count(Pu) * Weight(Pu) + Count(Rf) * Weight(Rf) + Count(Rg) * Weight(Rg) + Count(S) * Weight(S) + Count(Sg) * Weight(Sg) + Count(U) * Weight(U) + Count(V) * Weight(V) + Count(W) * Weight(W) + Count(Y) * Weight(Y) =
1 * 12.0107 + 1 * 1.00794 + 1 * 241.0568291 + 1 * 10.811 + 1 * 272.13803 + 1 * 247.070307 + 1 * 249.0748535 + 1 * 243.0613891 + 1 * 285.17411 + 1 * 268.12545 + 1 * 281.16206 + 1 * 252.08298 + 1 * 18.9984032 + 1 * 289.18728 + 1 * 257.095105 + 1 * 270.13465 + 1 * 126.90447 + 1 * 39.0983 + 1 * 262.10963 + 1 * 258.098431 + 1 * 276.15116 + 1 * 14.0067 + 1 * 259.10103 + 1 * 236.04657 + 1 * 15.9994 + 1 * 30.973762 + 1 * 231.03588 + 1 * 238.0495599 + 1 * 265.1167 + 1 * 280.16447 + 1 * 32.065 + 1 * 271.13347 + 1 * 238.02891 + 1 * 50.9415 + 1 * 183.84 + 1 * 88.90585 =
6595.9619 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWY

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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