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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBCNOFNeNaCaSWKUPAuAgBhSgLaLrAcPt is 2371.2765 g/mol

Convert between HHeLiBeBCNOFNeNaCaSWKUPAuAgBhSgLaLrAcPt weight and moles
CompoundMolesWeight, g
HHeLiBeBCNOFNeNaCaSWKUPAuAgBhSgLaLrAcPt

Elemental composition of HHeLiBeBCNOFNeNaCaSWKUPAuAgBhSgLaLrAcPt
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0425
HeliumHe4.00260210.1688
LithiumLi6.94110.2927
BerylliumBe9.01218210.3801
BoronB10.81110.4559
CarbonC12.010710.5065
NitrogenN14.006710.5907
OxygenO15.999410.6747
FluorineF18.998403210.8012
NeonNe20.179710.8510
SodiumNa22.9897692810.9695
CalciumCa40.07811.6901
SulfurS32.06511.3522
TungstenW183.8417.7528
PotassiumK39.098311.6488
UraniumU238.02891110.0380
PhosphorusP30.97376211.3062
GoldAu196.96656918.3064
SilverAg107.868214.5490
BohriumBh272.1380111.4764
SeaborgiumSg271.1335111.4341
LanthanumLa138.9054715.8578
LawrenciumLr262.1096111.0535
ActiniumAc227.02775219.5741
PlatinumPt195.08418.2270

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBCNOFNeNaCaSWKUPAuAgBhSgLaLrAcPt:
H: 1, He: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, Na: 1, Ca: 1, S: 1, W: 1, K: 1, U: 1, P: 1, Au: 1, Ag: 1, Bh: 1, Sg: 1, La: 1, Lr: 1, Ac: 1, Pt: 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, Ca: 40.078, S: 32.065, W: 183.84, K: 39.0983, U: 238.02891, P: 30.973762, Au: 196.966569, Ag: 107.8682, Bh: 272.13803, Sg: 271.13347, La: 138.90547, Lr: 262.10963, Ac: 227.0277521, Pt: 195.084

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBCNOFNeNaCaSWKUPAuAgBhSgLaLrAcPt) = ∑ 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(Ca) * Weight(Ca) + Count(S) * Weight(S) + Count(W) * Weight(W) + Count(K) * Weight(K) + Count(U) * Weight(U) + Count(P) * Weight(P) + Count(Au) * Weight(Au) + Count(Ag) * Weight(Ag) + Count(Bh) * Weight(Bh) + Count(Sg) * Weight(Sg) + Count(La) * Weight(La) + Count(Lr) * Weight(Lr) + Count(Ac) * Weight(Ac) + Count(Pt) * Weight(Pt) =
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 * 40.078 + 1 * 32.065 + 1 * 183.84 + 1 * 39.0983 + 1 * 238.02891 + 1 * 30.973762 + 1 * 196.966569 + 1 * 107.8682 + 1 * 272.13803 + 1 * 271.13347 + 1 * 138.90547 + 1 * 262.10963 + 1 * 227.0277521 + 1 * 195.084 =
2371.2765 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAcAgAuBBeBhCaFHeKLaLiLrNNaNeOPPtSSgUW

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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