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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBCNOFNeNaMgAlSiPSClArKCaGaGeAsSeBrKrRbSrInSnSbTeIXeCs is 1939.9728 g/mol

Convert between HHeLiBeBCNOFNeNaMgAlSiPSClArKCaGaGeAsSeBrKrRbSrInSnSbTeIXeCs weight and moles
CompoundMolesWeight, g
HHeLiBeBCNOFNeNaMgAlSiPSClArKCaGaGeAsSeBrKrRbSrInSnSbTeIXeCs

Elemental composition of HHeLiBeBCNOFNeNaMgAlSiPSClArKCaGaGeAsSeBrKrRbSrInSnSbTeIXeCs
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0520
HeliumHe4.00260210.2063
LithiumLi6.94110.3578
BerylliumBe9.01218210.4646
BoronB10.81110.5573
CarbonC12.010710.6191
NitrogenN14.006710.7220
OxygenO15.999410.8247
FluorineF18.998403210.9793
NeonNe20.179711.0402
SodiumNa22.9897692811.1851
MagnesiumMg24.305011.2529
AluminumAl26.981538611.3908
SiliconSi28.085511.4477
PhosphorusP30.97376211.5966
SulfurS32.06511.6529
ChlorineCl35.45311.8275
ArgonAr39.94812.0592
PotassiumK39.098312.0154
CalciumCa40.07812.0659
GalliumGa69.72313.5940
GermaniumGe72.6413.7444
ArsenicAs74.9216013.8620
SeleniumSe78.9614.0702
BromineBr79.90414.1188
KryptonKr83.79814.3195
RubidiumRb85.467814.4056
StrontiumSr87.6214.5166
IndiumIn114.81815.9185
TinSn118.71016.1192
AntimonySb121.76016.2764
TelluriumTe127.6016.5774
IodineI126.9044716.5416
XenonXe131.29316.7678
CesiumCs132.905451916.8509

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBCNOFNeNaMgAlSiPSClArKCaGaGeAsSeBrKrRbSrInSnSbTeIXeCs:
H: 1, He: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, Na: 1, Mg: 1, Al: 1, Si: 1, P: 1, S: 1, Cl: 1, Ar: 1, K: 1, Ca: 1, Ga: 1, Ge: 1, As: 1, Se: 1, Br: 1, Kr: 1, Rb: 1, Sr: 1, In: 1, Sn: 1, Sb: 1, Te: 1, I: 1, Xe: 1, Cs: 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, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, Ar: 39.948, K: 39.0983, Ca: 40.078, Ga: 69.723, Ge: 72.64, As: 74.9216, Se: 78.96, Br: 79.904, Kr: 83.798, Rb: 85.4678, Sr: 87.62, In: 114.818, Sn: 118.71, Sb: 121.76, Te: 127.6, I: 126.90447, Xe: 131.293, Cs: 132.9054519

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBCNOFNeNaMgAlSiPSClArKCaGaGeAsSeBrKrRbSrInSnSbTeIXeCs) = ∑ 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(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Ga) * Weight(Ga) + Count(Ge) * Weight(Ge) + Count(As) * Weight(As) + Count(Se) * Weight(Se) + Count(Br) * Weight(Br) + Count(Kr) * Weight(Kr) + Count(Rb) * Weight(Rb) + Count(Sr) * Weight(Sr) + Count(In) * Weight(In) + Count(Sn) * Weight(Sn) + Count(Sb) * Weight(Sb) + Count(Te) * Weight(Te) + Count(I) * Weight(I) + Count(Xe) * Weight(Xe) + Count(Cs) * Weight(Cs) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 1 * 39.948 + 1 * 39.0983 + 1 * 40.078 + 1 * 69.723 + 1 * 72.64 + 1 * 74.9216 + 1 * 78.96 + 1 * 79.904 + 1 * 83.798 + 1 * 85.4678 + 1 * 87.62 + 1 * 114.818 + 1 * 118.71 + 1 * 121.76 + 1 * 127.6 + 1 * 126.90447 + 1 * 131.293 + 1 * 132.9054519 =
1939.9728 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBeBrCaClCsFGaGeHeIInKKrLiMgNNaNeOPRbSSbSeSiSnSrTeXe

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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