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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of CHClFONCoAsFePtSbSnAuAgHgCuWCsNaSSiBrILiMgPAlMnSrBaRaTcNbYZr is 2863.4492 g/mol

Convert between CHClFONCoAsFePtSbSnAuAgHgCuWCsNaSSiBrILiMgPAlMnSrBaRaTcNbYZr weight and moles
CompoundMolesWeight, g
CHClFONCoAsFePtSbSnAuAgHgCuWCsNaSSiBrILiMgPAlMnSrBaRaTcNbYZr

Elemental composition of CHClFONCoAsFePtSbSnAuAgHgCuWCsNaSSiBrILiMgPAlMnSrBaRaTcNbYZr
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.010710.4194
HydrogenH1.0079410.0352
ChlorineCl35.45311.2381
FluorineF18.998403210.6635
OxygenO15.999410.5587
NitrogenN14.006710.4892
CobaltCo58.93319512.0581
ArsenicAs74.9216012.6165
IronFe55.84511.9503
PlatinumPt195.08416.8129
AntimonySb121.76014.2522
TinSn118.71014.1457
GoldAu196.96656916.8786
SilverAg107.868213.7671
MercuryHg200.5917.0052
CopperCu63.54612.2192
TungstenW183.8416.4202
CesiumCs132.905451914.6414
SodiumNa22.9897692810.8029
SulfurS32.06511.1198
SiliconSi28.085510.9808
BromineBr79.90412.7905
IodineI126.9044714.4319
LithiumLi6.94110.2424
MagnesiumMg24.305010.8488
PhosphorusP30.97376211.0817
AluminumAl26.981538610.9423
ManganeseMn54.93804511.9186
StrontiumSr87.6213.0599
BariumBa137.32714.7959
RadiumRa226.02541017.8935
TechnetiumTc96.90636513.3843
NiobiumNb92.9063813.2446
YttriumY88.9058513.1049
ZirconiumZr91.22413.1858

Computing molar mass step by step

First, compute the number of each atom in CHClFONCoAsFePtSbSnAuAgHgCuWCsNaSSiBrILiMgPAlMnSrBaRaTcNbYZr:
C: 1, H: 1, Cl: 1, F: 1, O: 1, N: 1, Co: 1, As: 1, Fe: 1, Pt: 1, Sb: 1, Sn: 1, Au: 1, Ag: 1, Hg: 1, Cu: 1, W: 1, Cs: 1, Na: 1, S: 1, Si: 1, Br: 1, I: 1, Li: 1, Mg: 1, P: 1, Al: 1, Mn: 1, Sr: 1, Ba: 1, Ra: 1, Tc: 1, Nb: 1, Y: 1, Zr: 1

Then, lookup atomic weights for each element in periodic table:
C: 12.0107, H: 1.00794, Cl: 35.453, F: 18.9984032, O: 15.9994, N: 14.0067, Co: 58.933195, As: 74.9216, Fe: 55.845, Pt: 195.084, Sb: 121.76, Sn: 118.71, Au: 196.966569, Ag: 107.8682, Hg: 200.59, Cu: 63.546, W: 183.84, Cs: 132.9054519, Na: 22.98976928, S: 32.065, Si: 28.0855, Br: 79.904, I: 126.90447, Li: 6.941, Mg: 24.305, P: 30.973762, Al: 26.9815386, Mn: 54.938045, Sr: 87.62, Ba: 137.327, Ra: 226.0254098, Tc: 96.906365, Nb: 92.90638, Y: 88.90585, Zr: 91.224

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (CHClFONCoAsFePtSbSnAuAgHgCuWCsNaSSiBrILiMgPAlMnSrBaRaTcNbYZr) = ∑ Counti * Weighti =
Count(C) * Weight(C) + Count(H) * Weight(H) + Count(Cl) * Weight(Cl) + Count(F) * Weight(F) + Count(O) * Weight(O) + Count(N) * Weight(N) + Count(Co) * Weight(Co) + Count(As) * Weight(As) + Count(Fe) * Weight(Fe) + Count(Pt) * Weight(Pt) + Count(Sb) * Weight(Sb) + Count(Sn) * Weight(Sn) + Count(Au) * Weight(Au) + Count(Ag) * Weight(Ag) + Count(Hg) * Weight(Hg) + Count(Cu) * Weight(Cu) + Count(W) * Weight(W) + Count(Cs) * Weight(Cs) + Count(Na) * Weight(Na) + Count(S) * Weight(S) + Count(Si) * Weight(Si) + Count(Br) * Weight(Br) + Count(I) * Weight(I) + Count(Li) * Weight(Li) + Count(Mg) * Weight(Mg) + Count(P) * Weight(P) + Count(Al) * Weight(Al) + Count(Mn) * Weight(Mn) + Count(Sr) * Weight(Sr) + Count(Ba) * Weight(Ba) + Count(Ra) * Weight(Ra) + Count(Tc) * Weight(Tc) + Count(Nb) * Weight(Nb) + Count(Y) * Weight(Y) + Count(Zr) * Weight(Zr) =
1 * 12.0107 + 1 * 1.00794 + 1 * 35.453 + 1 * 18.9984032 + 1 * 15.9994 + 1 * 14.0067 + 1 * 58.933195 + 1 * 74.9216 + 1 * 55.845 + 1 * 195.084 + 1 * 121.76 + 1 * 118.71 + 1 * 196.966569 + 1 * 107.8682 + 1 * 200.59 + 1 * 63.546 + 1 * 183.84 + 1 * 132.9054519 + 1 * 22.98976928 + 1 * 32.065 + 1 * 28.0855 + 1 * 79.904 + 1 * 126.90447 + 1 * 6.941 + 1 * 24.305 + 1 * 30.973762 + 1 * 26.9815386 + 1 * 54.938045 + 1 * 87.62 + 1 * 137.327 + 1 * 226.0254098 + 1 * 96.906365 + 1 * 92.90638 + 1 * 88.90585 + 1 * 91.224 =
2863.4492 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAlAsAuBaBrClCoCsCuFFeHgILiMgMnNNaNbOPPtRaSSbSiSnSrTcWYZr

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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