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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeNONeXeIAgAuPbYCAmFrFBDKNOPSUVWY is 2116.1046 g/mol

Convert between HHeNONeXeIAgAuPbYCAmFrFBDKNOPSUVWY weight and moles
CompoundMolesWeight, g
HHeNONeXeIAgAuPbYCAmFrFBDKNOPSUVWY

Elemental composition of HHeNONeXeIAgAuPbYCAmFrFBDKNOPSUVWY
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0476
HeliumHe4.00260210.1891
NitrogenN14.006721.3238
OxygenO15.999421.5122
NeonNe20.179710.9536
XenonXe131.29316.2045
IodineI126.9044715.9971
SilverAg107.868215.0975
GoldAu196.96656919.3080
LeadPb207.219.7916
YttriumY88.9058528.4028
CarbonC12.010710.5676
AmericiumAm241.056829111.3915
FranciumFr223.019736110.5392
FluorineF18.998403210.8978
BoronB10.81110.5109
PotassiumK39.098311.8477
PhosphorusP30.97376211.4637
SulfurS32.06511.5153
UraniumU238.02891111.2484
VanadiumV50.941512.4073
TungstenW183.8418.6877
HydrogenD2.014101777810.0952

Computing molar mass step by step

First, compute the number of each atom in HHeNONeXeIAgAuPbYCAmFrFBDKNOPSUVWY:
H: 1, He: 1, N: 2, O: 2, Ne: 1, Xe: 1, I: 1, Ag: 1, Au: 1, Pb: 1, Y: 2, C: 1, Am: 1, Fr: 1, F: 1, B: 1, K: 1, P: 1, S: 1, U: 1, V: 1, W: 1, D: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, N: 14.0067, O: 15.9994, Ne: 20.1797, Xe: 131.293, I: 126.90447, Ag: 107.8682, Au: 196.966569, Pb: 207.2, Y: 88.90585, C: 12.0107, Am: 241.0568291, Fr: 223.0197359, F: 18.9984032, B: 10.811, K: 39.0983, P: 30.973762, S: 32.065, U: 238.02891, V: 50.9415, W: 183.84, D: 2.0141017778

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeNONeXeIAgAuPbYCAmFrFBDKNOPSUVWY) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(Ne) * Weight(Ne) + Count(Xe) * Weight(Xe) + Count(I) * Weight(I) + Count(Ag) * Weight(Ag) + Count(Au) * Weight(Au) + Count(Pb) * Weight(Pb) + Count(Y) * Weight(Y) + Count(C) * Weight(C) + Count(Am) * Weight(Am) + Count(Fr) * Weight(Fr) + Count(F) * Weight(F) + Count(B) * Weight(B) + Count(K) * Weight(K) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(U) * Weight(U) + Count(V) * Weight(V) + Count(W) * Weight(W) + Count(D) * Weight(D) =
1 * 1.00794 + 1 * 4.002602 + 2 * 14.0067 + 2 * 15.9994 + 1 * 20.1797 + 1 * 131.293 + 1 * 126.90447 + 1 * 107.8682 + 1 * 196.966569 + 1 * 207.2 + 2 * 88.90585 + 1 * 12.0107 + 1 * 241.0568291 + 1 * 223.0197359 + 1 * 18.9984032 + 1 * 10.811 + 1 * 39.0983 + 1 * 30.973762 + 1 * 32.065 + 1 * 238.02891 + 1 * 50.9415 + 1 * 183.84 + 1 * 2.0141017778 =
2116.1046 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAmAuBFFrDHeIKN2NeO2PPbSUVWXeY2

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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