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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HOCNURaThHgAuAlAgPoAsAtPSClLiBeFeCuKCaScYMnMgTiSrPbIArXeHeGe is 3009.0067 g/mol

Convert between HOCNURaThHgAuAlAgPoAsAtPSClLiBeFeCuKCaScYMnMgTiSrPbIArXeHeGe weight and moles
CompoundMolesWeight, g
HOCNURaThHgAuAlAgPoAsAtPSClLiBeFeCuKCaScYMnMgTiSrPbIArXeHeGe

Elemental composition of HOCNURaThHgAuAlAgPoAsAtPSClLiBeFeCuKCaScYMnMgTiSrPbIArXeHeGe
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0335
OxygenO15.999410.5317
CarbonC12.010710.3992
NitrogenN14.006710.4655
UraniumU238.0289117.9105
RadiumRa226.02541017.5116
ThoriumTh232.0380617.7115
MercuryHg200.5916.6663
GoldAu196.96656916.5459
AluminumAl26.981538610.8967
SilverAg107.868213.5848
PoloniumPo208.98243016.9452
ArsenicAs74.9216012.4899
AstatineAt209.98714816.9786
PhosphorusP30.97376211.0294
SulfurS32.06511.0656
ChlorineCl35.45311.1782
LithiumLi6.94110.2307
BerylliumBe9.01218210.2995
IronFe55.84511.8559
CopperCu63.54612.1119
PotassiumK39.098311.2994
CalciumCa40.07811.3319
ScandiumSc44.95591211.4940
YttriumY88.9058512.9547
ManganeseMn54.93804511.8258
MagnesiumMg24.305010.8077
TitaniumTi47.86711.5908
StrontiumSr87.6212.9119
LeadPb207.216.8860
IodineI126.9044714.2175
ArgonAr39.94811.3276
XenonXe131.29314.3633
HeliumHe4.00260210.1330
GermaniumGe72.6412.4141

Computing molar mass step by step

First, compute the number of each atom in HOCNURaThHgAuAlAgPoAsAtPSClLiBeFeCuKCaScYMnMgTiSrPbIArXeHeGe:
H: 1, O: 1, C: 1, N: 1, U: 1, Ra: 1, Th: 1, Hg: 1, Au: 1, Al: 1, Ag: 1, Po: 1, As: 1, At: 1, P: 1, S: 1, Cl: 1, Li: 1, Be: 1, Fe: 1, Cu: 1, K: 1, Ca: 1, Sc: 1, Y: 1, Mn: 1, Mg: 1, Ti: 1, Sr: 1, Pb: 1, I: 1, Ar: 1, Xe: 1, He: 1, Ge: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, O: 15.9994, C: 12.0107, N: 14.0067, U: 238.02891, Ra: 226.0254098, Th: 232.03806, Hg: 200.59, Au: 196.966569, Al: 26.9815386, Ag: 107.8682, Po: 208.9824304, As: 74.9216, At: 209.987148, P: 30.973762, S: 32.065, Cl: 35.453, Li: 6.941, Be: 9.012182, Fe: 55.845, Cu: 63.546, K: 39.0983, Ca: 40.078, Sc: 44.955912, Y: 88.90585, Mn: 54.938045, Mg: 24.305, Ti: 47.867, Sr: 87.62, Pb: 207.2, I: 126.90447, Ar: 39.948, Xe: 131.293, He: 4.002602, Ge: 72.64

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HOCNURaThHgAuAlAgPoAsAtPSClLiBeFeCuKCaScYMnMgTiSrPbIArXeHeGe) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(O) * Weight(O) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(U) * Weight(U) + Count(Ra) * Weight(Ra) + Count(Th) * Weight(Th) + Count(Hg) * Weight(Hg) + Count(Au) * Weight(Au) + Count(Al) * Weight(Al) + Count(Ag) * Weight(Ag) + Count(Po) * Weight(Po) + Count(As) * Weight(As) + Count(At) * Weight(At) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(Fe) * Weight(Fe) + Count(Cu) * Weight(Cu) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Sc) * Weight(Sc) + Count(Y) * Weight(Y) + Count(Mn) * Weight(Mn) + Count(Mg) * Weight(Mg) + Count(Ti) * Weight(Ti) + Count(Sr) * Weight(Sr) + Count(Pb) * Weight(Pb) + Count(I) * Weight(I) + Count(Ar) * Weight(Ar) + Count(Xe) * Weight(Xe) + Count(He) * Weight(He) + Count(Ge) * Weight(Ge) =
1 * 1.00794 + 1 * 15.9994 + 1 * 12.0107 + 1 * 14.0067 + 1 * 238.02891 + 1 * 226.0254098 + 1 * 232.03806 + 1 * 200.59 + 1 * 196.966569 + 1 * 26.9815386 + 1 * 107.8682 + 1 * 208.9824304 + 1 * 74.9216 + 1 * 209.987148 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 1 * 6.941 + 1 * 9.012182 + 1 * 55.845 + 1 * 63.546 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 88.90585 + 1 * 54.938045 + 1 * 24.305 + 1 * 47.867 + 1 * 87.62 + 1 * 207.2 + 1 * 126.90447 + 1 * 39.948 + 1 * 131.293 + 1 * 4.002602 + 1 * 72.64 =
3009.0067 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAlArAsAtAuBeCaClCuFeGeHeHgIKLiMgMnNOPPbPoRaSScSrThTiUXeY

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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