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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWYTh is 6827.9999 g/mol

Convert between CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWYTh weight and moles
CompoundMolesWeight, g
CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWYTh

Elemental composition of CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWYTh
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.010710.1759
HydrogenH1.0079410.0148
AmericiumAm241.05682913.5304
BoronB10.81110.1583
BohriumBh272.138013.9856
BerkeliumBk247.07030713.6185
CaliforniumCf249.07485313.6478
CuriumCm243.06138913.5598
CoperniciumCn285.174114.1765
DubniumDb268.125513.9269
DarmstadtiumDs281.162114.1178
EinsteiniumEs252.0829813.6919
FluorineF18.998403210.2782
FleroviumFl289.187314.2353
FermiumFm257.09510513.7653
HassiumHs270.134713.9563
IodineI126.9044711.8586
PotassiumK39.098310.5726
LawrenciumLr262.109613.8387
MendeleviumMd258.09843113.7800
MeitneriumMt276.151214.0444
NitrogenN14.006710.2051
NobeliumNo259.101013.7947
NeptuniumNp236.0465713.4570
OxygenO15.999410.2343
PhosphorusP30.97376210.4536
ProtactiniumPa231.0358813.3837
PlutoniumPu238.04956013.4864
RutherfordiumRf265.116713.8828
RoentgeniumRg280.164514.1032
SulfurS32.06510.4696
SeaborgiumSg271.133513.9709
UraniumU238.0289113.4861
VanadiumV50.941510.7461
TungstenW183.8412.6924
YttriumY88.9058511.3021
ThoriumTh232.0380613.3983

Computing molar mass step by step

First, compute the number of each atom in CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWYTh:
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, Th: 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, Th: 232.03806

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgUVWYTh) = ∑ 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) + Count(Th) * Weight(Th) =
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 + 1 * 232.03806 =
6827.9999 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAmBBhBkCfCmCnDbDsEsFFlFmHsIKLrMdMtNNoNpOPPaPuRfRgSSgThUVWY

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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