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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAu is 3145.2917 g/mol

Convert between HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAu weight and moles
CompoundMolesWeight, g
HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAu

Elemental composition of HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAu
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0320
HeliumHe4.00260210.1273
LithiumLi6.94110.2207
BerylliumBe9.01218210.2865
BoronB10.81110.3437
CarbonC12.010710.3819
OxygenO15.999410.5087
NitrogenN14.006710.4453
FluorineF18.998403210.6040
NeonNe20.179710.6416
SodiumNa22.9897692810.7309
ChlorineCl35.45311.1272
BromineBr79.90412.5404
UraniumU238.0289117.5678
PlutoniumPu238.04956017.5684
FleroviumFl289.187319.1943
PoloniumPo208.98243016.6443
BismuthBi208.9804016.6442
PhosphorusP30.97376210.9848
SulfurS32.06511.0195
ActiniumAc227.02775217.2180
LanthanumLa138.9054714.4163
YttriumY88.9058512.8266
CesiumCs132.905451914.2255
RubidiumRb85.467812.7173
RadiumRa226.02541017.1862
RadonRn210.99060116.7081
XenonXe131.29314.1743
ArgonAr39.94811.2701
IronFe55.84511.7755
CopperCu63.54612.0204
TitaniumTi47.86711.5219
GoldAu196.96656916.2623
HydrogenD2.014101777810.0640

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAu:
H: 1, He: 1, Li: 1, Be: 1, B: 1, C: 1, O: 1, N: 1, F: 1, Ne: 1, Na: 1, Cl: 1, Br: 1, U: 1, Pu: 1, Fl: 1, Po: 1, Bi: 1, P: 1, S: 1, Ac: 1, La: 1, Y: 1, Cs: 1, Rb: 1, Ra: 1, Rn: 1, Xe: 1, Ar: 1, Fe: 1, Cu: 1, Ti: 1, Au: 1, D: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, O: 15.9994, N: 14.0067, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Cl: 35.453, Br: 79.904, U: 238.02891, Pu: 238.0495599, Fl: 289.18728, Po: 208.9824304, Bi: 208.9804, P: 30.973762, S: 32.065, Ac: 227.0277521, La: 138.90547, Y: 88.90585, Cs: 132.9054519, Rb: 85.4678, Ra: 226.0254098, Rn: 210.990601, Xe: 131.293, Ar: 39.948, Fe: 55.845, Cu: 63.546, Ti: 47.867, Au: 196.966569, D: 2.0141017778

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBCONFNeNaClBrDUPuFlPoBiPSAcLaYCsRbRaRnXeArFeCuTiAu) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(O) * Weight(O) + Count(N) * Weight(N) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Cl) * Weight(Cl) + Count(Br) * Weight(Br) + Count(U) * Weight(U) + Count(Pu) * Weight(Pu) + Count(Fl) * Weight(Fl) + Count(Po) * Weight(Po) + Count(Bi) * Weight(Bi) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Ac) * Weight(Ac) + Count(La) * Weight(La) + Count(Y) * Weight(Y) + Count(Cs) * Weight(Cs) + Count(Rb) * Weight(Rb) + Count(Ra) * Weight(Ra) + Count(Rn) * Weight(Rn) + Count(Xe) * Weight(Xe) + Count(Ar) * Weight(Ar) + Count(Fe) * Weight(Fe) + Count(Cu) * Weight(Cu) + Count(Ti) * Weight(Ti) + Count(Au) * Weight(Au) + Count(D) * Weight(D) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 15.9994 + 1 * 14.0067 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 22.98976928 + 1 * 35.453 + 1 * 79.904 + 1 * 238.02891 + 1 * 238.0495599 + 1 * 289.18728 + 1 * 208.9824304 + 1 * 208.9804 + 1 * 30.973762 + 1 * 32.065 + 1 * 227.0277521 + 1 * 138.90547 + 1 * 88.90585 + 1 * 132.9054519 + 1 * 85.4678 + 1 * 226.0254098 + 1 * 210.990601 + 1 * 131.293 + 1 * 39.948 + 1 * 55.845 + 1 * 63.546 + 1 * 47.867 + 1 * 196.966569 + 1 * 2.0141017778 =
3145.2917 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAcArAuBBeBiBrClCsCuFFeFlDHeLaLiNNaNeOPPoPuRaRbRnSTiUXeY

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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