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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPbW is 4680.2635 g/mol

Convert between HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPbW weight and moles
CompoundMolesWeight, g
HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPbW

Elemental composition of HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPbW
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0215
BoronB10.81110.2310
CarbonC12.010710.2566
NitrogenN14.006710.2993
OxygenO15.999410.3418
FluorineF18.998403210.4059
PhosphorusP30.97376210.6618
SulfurS32.06510.6851
PotassiumK39.098310.8354
VanadiumV50.941511.0884
YttriumY88.9058511.8996
IodineI126.9044712.7115
TungstenW183.8427.8560
UraniumU238.0289115.0858
LanthanumLa138.9054712.9679
CeriumCe140.11612.9938
PraseodymiumPr140.9076513.0107
NeodymiumNd144.24213.0819
PromethiumPm144.91274913.0963
TechnetiumTc96.90636512.0705
SamariumSm150.3613.2126
NeptuniumNp236.0465715.0434
PlutoniumPu238.04956015.0862
AmericiumAm241.05682915.1505
CuriumCm243.06138915.1933
CoperniciumCn285.174116.0931
RoentgeniumRg280.164515.9861
SodiumNa22.9897692810.4912
LithiumLi6.94110.1483
RutheniumRu101.0712.1595
RhodiumRh102.9055012.1987
SilverAg107.868212.3047
GoldAu196.96656914.2085
MercuryHg200.5914.2859
ThalliumTl204.383314.3669
LeadPb207.214.4271
HydrogenD2.014101777810.0430

Computing molar mass step by step

First, compute the number of each atom in HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPbW:
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: 2, 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 (HDBCNOFPSKVYIWULaCePrNdPmTcSmNpPuAmCmCnRgNaLiRuRhAgAuHgTlPbW) = ∑ 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 + 2 * 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 =
4680.2635 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAmAuBCeCmCnFDHgIKLaLiNNaNdNpOPPbPmPrPuRgRhRuSSmTcTlUVW2Y

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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