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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPb is 4496.4235 g/mol

Convert between HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPb weight and moles
CompoundMolesWeight, g
HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPb

Elemental composition of HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPb
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0224
BoronB10.81110.2404
CarbonC12.010710.2671
NitrogenN14.006710.3115
OxygenO15.999410.3558
FluorineF18.998403210.4225
PhosphorusP30.97376210.6889
SulfurS32.06510.7131
PotassiumK39.098310.8695
VanadiumV50.941511.1329
YttriumY88.9058511.9773
IodineI126.9044712.8223
TungstenW183.8414.0886
UraniumU238.0289115.2937
LanthanumLa138.9054713.0892
CeriumCe140.11613.1162
PraseodymiumPr140.9076513.1338
NeodymiumNd144.24213.2079
PromethiumPm144.91274913.2228
TechnetiumTc96.90636512.1552
SamariumSm150.3613.3440
NeptuniumNp236.0465715.2497
PlutoniumPu238.04956015.2942
AmericiumAm241.05682915.3611
CuriumCm243.06138915.4057
CoperniciumCn285.174116.3422
RoentgeniumRg280.164516.2308
SodiumNa22.9897692810.5113
LithiumLi6.94110.1544
RutheniumRu101.0712.2478
RhodiumRh102.9055012.2886
SilverAg107.868212.3990
GoldAu196.96656914.3805
MercuryHg200.5914.4611
ThalliumTl204.383314.5455
LeadPb207.214.6081
HydrogenD2.014101777810.0448

Computing molar mass step by step

First, compute the number of each atom in HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPb:
H: 1, B: 1, C: 1, N: 1, O: 1, F: 1, P: 1, S: 1, K: 1, V: 1, Y: 1, I: 1, W: 1, U: 1, La: 1, Ce: 1, Pr: 1, Nd: 1, Pm: 1, Tc: 1, Sm: 1, Np: 1, Pu: 1, Am: 1, Cm: 1, Cn: 1, Rg: 1, Na: 1, Li: 1, Ru: 1, Rh: 1, Ag: 1, Au: 1, Hg: 1, Tl: 1, Pb: 1, D: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, P: 30.973762, S: 32.065, K: 39.0983, V: 50.9415, Y: 88.90585, I: 126.90447, W: 183.84, U: 238.02891, La: 138.90547, Ce: 140.116, Pr: 140.90765, Nd: 144.242, Pm: 144.912749, Tc: 96.906365, Sm: 150.36, Np: 236.04657, Pu: 238.0495599, Am: 241.0568291, Cm: 243.0613891, Cn: 285.17411, Rg: 280.16447, Na: 22.98976928, Li: 6.941, Ru: 101.07, Rh: 102.9055, Ag: 107.8682, Au: 196.966569, Hg: 200.59, Tl: 204.3833, Pb: 207.2, D: 2.0141017778

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPb) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(K) * Weight(K) + Count(V) * Weight(V) + Count(Y) * Weight(Y) + Count(I) * Weight(I) + Count(W) * Weight(W) + Count(U) * Weight(U) + Count(La) * Weight(La) + Count(Ce) * Weight(Ce) + Count(Pr) * Weight(Pr) + Count(Nd) * Weight(Nd) + Count(Pm) * Weight(Pm) + Count(Tc) * Weight(Tc) + Count(Sm) * Weight(Sm) + Count(Np) * Weight(Np) + Count(Pu) * Weight(Pu) + Count(Am) * Weight(Am) + Count(Cm) * Weight(Cm) + Count(Cn) * Weight(Cn) + Count(Rg) * Weight(Rg) + Count(Na) * Weight(Na) + Count(Li) * Weight(Li) + Count(Ru) * Weight(Ru) + Count(Rh) * Weight(Rh) + Count(Ag) * Weight(Ag) + Count(Au) * Weight(Au) + Count(Hg) * Weight(Hg) + Count(Tl) * Weight(Tl) + Count(Pb) * Weight(Pb) + Count(D) * Weight(D) =
1 * 1.00794 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 30.973762 + 1 * 32.065 + 1 * 39.0983 + 1 * 50.9415 + 1 * 88.90585 + 1 * 126.90447 + 1 * 183.84 + 1 * 238.02891 + 1 * 138.90547 + 1 * 140.116 + 1 * 140.90765 + 1 * 144.242 + 1 * 144.912749 + 1 * 96.906365 + 1 * 150.36 + 1 * 236.04657 + 1 * 238.0495599 + 1 * 241.0568291 + 1 * 243.0613891 + 1 * 285.17411 + 1 * 280.16447 + 1 * 22.98976928 + 1 * 6.941 + 1 * 101.07 + 1 * 102.9055 + 1 * 107.8682 + 1 * 196.966569 + 1 * 200.59 + 1 * 204.3833 + 1 * 207.2 + 1 * 2.0141017778 =
4496.4235 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAmAuBCeCmCnFDHgIKLaLiNNaNdNpOPPbPmPrPuRgRhRuSSmTcTlUVWY

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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