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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of ArBCDEuFGeHIFeKLiMgNOPCrRnSTiUVWXeYZn is 1724.7757 g/mol

Convert between ArBCDEuFGeHIFeKLiMgNOPCrRnSTiUVWXeYZn weight and moles
CompoundMolesWeight, g
ArBCDEuFGeHIFeKLiMgNOPCrRnSTiUVWXeYZn

Elemental composition of ArBCDEuFGeHIFeKLiMgNOPCrRnSTiUVWXeYZn
ElementSymbolAtomic weightAtomsMass percent
ArgonAr39.94812.3161
BoronB10.81110.6268
CarbonC12.010710.6964
EuropiumEu151.96418.8107
FluorineF18.998403211.1015
GermaniumGe72.6414.2116
HydrogenH1.0079410.0584
IodineI126.9044717.3577
IronFe55.84513.2378
PotassiumK39.098312.2669
LithiumLi6.94110.4024
MagnesiumMg24.305011.4092
NitrogenN14.006710.8121
OxygenO15.999410.9276
PhosphorusP30.97376211.7958
ChromiumCr51.996113.0147
RadonRn210.990601112.2329
SulfurS32.06511.8591
TitaniumTi47.86712.7753
UraniumU238.02891113.8006
VanadiumV50.941512.9535
TungstenW183.84110.6588
XenonXe131.29317.6122
YttriumY88.9058515.1546
ZincZn65.3813.7906
HydrogenD2.014101777810.1168

Computing molar mass step by step

First, compute the number of each atom in ArBCDEuFGeHIFeKLiMgNOPCrRnSTiUVWXeYZn:
Ar: 1, B: 1, C: 1, Eu: 1, F: 1, Ge: 1, H: 1, I: 1, Fe: 1, K: 1, Li: 1, Mg: 1, N: 1, O: 1, P: 1, Cr: 1, Rn: 1, S: 1, Ti: 1, U: 1, V: 1, W: 1, Xe: 1, Y: 1, Zn: 1, D: 1

Then, lookup atomic weights for each element in periodic table:
Ar: 39.948, B: 10.811, C: 12.0107, Eu: 151.964, F: 18.9984032, Ge: 72.64, H: 1.00794, I: 126.90447, Fe: 55.845, K: 39.0983, Li: 6.941, Mg: 24.305, N: 14.0067, O: 15.9994, P: 30.973762, Cr: 51.9961, Rn: 210.990601, S: 32.065, Ti: 47.867, U: 238.02891, V: 50.9415, W: 183.84, Xe: 131.293, Y: 88.90585, Zn: 65.38, D: 2.0141017778

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (ArBCDEuFGeHIFeKLiMgNOPCrRnSTiUVWXeYZn) = ∑ Counti * Weighti =
Count(Ar) * Weight(Ar) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(Eu) * Weight(Eu) + Count(F) * Weight(F) + Count(Ge) * Weight(Ge) + Count(H) * Weight(H) + Count(I) * Weight(I) + Count(Fe) * Weight(Fe) + Count(K) * Weight(K) + Count(Li) * Weight(Li) + Count(Mg) * Weight(Mg) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(Cr) * Weight(Cr) + Count(Rn) * Weight(Rn) + Count(S) * Weight(S) + Count(Ti) * Weight(Ti) + Count(U) * Weight(U) + Count(V) * Weight(V) + Count(W) * Weight(W) + Count(Xe) * Weight(Xe) + Count(Y) * Weight(Y) + Count(Zn) * Weight(Zn) + Count(D) * Weight(D) =
1 * 39.948 + 1 * 10.811 + 1 * 12.0107 + 1 * 151.964 + 1 * 18.9984032 + 1 * 72.64 + 1 * 1.00794 + 1 * 126.90447 + 1 * 55.845 + 1 * 39.0983 + 1 * 6.941 + 1 * 24.305 + 1 * 14.0067 + 1 * 15.9994 + 1 * 30.973762 + 1 * 51.9961 + 1 * 210.990601 + 1 * 32.065 + 1 * 47.867 + 1 * 238.02891 + 1 * 50.9415 + 1 * 183.84 + 1 * 131.293 + 1 * 88.90585 + 1 * 65.38 + 1 * 2.0141017778 =
1724.7757 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHArBCrEuFFeGeDIKLiMgNOPRnSTiUVWXeYZn

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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