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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Hg2Sb2O7CrNiAgFeAsAlCuPbSiBiMgCoSnAu is 2039.7283 g/mol

Convert between Hg2Sb2O7CrNiAgFeAsAlCuPbSiBiMgCoSnAu weight and moles
CompoundMolesWeight, g
Hg2Sb2O7CrNiAgFeAsAlCuPbSiBiMgCoSnAu

Elemental composition of Hg2Sb2O7CrNiAgFeAsAlCuPbSiBiMgCoSnAu
ElementSymbolAtomic weightAtomsMass percent
MercuryHg200.59219.6683
AntimonySb121.760211.9388
OxygenO15.999475.4907
ChromiumCr51.996112.5492
NickelNi58.693412.8775
SilverAg107.868215.2884
IronFe55.84512.7379
ArsenicAs74.9216013.6731
AluminumAl26.981538611.3228
CopperCu63.54613.1154
LeadPb207.2110.1582
SiliconSi28.085511.3769
BismuthBi208.98040110.2455
MagnesiumMg24.305011.1916
CobaltCo58.93319512.8893
TinSn118.71015.8199
GoldAu196.96656919.6565

Computing molar mass step by step

First, compute the number of each atom in Hg2Sb2O7CrNiAgFeAsAlCuPbSiBiMgCoSnAu:
Hg: 2, Sb: 2, O: 7, Cr: 1, Ni: 1, Ag: 1, Fe: 1, As: 1, Al: 1, Cu: 1, Pb: 1, Si: 1, Bi: 1, Mg: 1, Co: 1, Sn: 1, Au: 1

Then, lookup atomic weights for each element in periodic table:
Hg: 200.59, Sb: 121.76, O: 15.9994, Cr: 51.9961, Ni: 58.6934, Ag: 107.8682, Fe: 55.845, As: 74.9216, Al: 26.9815386, Cu: 63.546, Pb: 207.2, Si: 28.0855, Bi: 208.9804, Mg: 24.305, Co: 58.933195, Sn: 118.71, Au: 196.966569

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (Hg2Sb2O7CrNiAgFeAsAlCuPbSiBiMgCoSnAu) = ∑ Counti * Weighti =
Count(Hg) * Weight(Hg) + Count(Sb) * Weight(Sb) + Count(O) * Weight(O) + Count(Cr) * Weight(Cr) + Count(Ni) * Weight(Ni) + Count(Ag) * Weight(Ag) + Count(Fe) * Weight(Fe) + Count(As) * Weight(As) + Count(Al) * Weight(Al) + Count(Cu) * Weight(Cu) + Count(Pb) * Weight(Pb) + Count(Si) * Weight(Si) + Count(Bi) * Weight(Bi) + Count(Mg) * Weight(Mg) + Count(Co) * Weight(Co) + Count(Sn) * Weight(Sn) + Count(Au) * Weight(Au) =
2 * 200.59 + 2 * 121.76 + 7 * 15.9994 + 1 * 51.9961 + 1 * 58.6934 + 1 * 107.8682 + 1 * 55.845 + 1 * 74.9216 + 1 * 26.9815386 + 1 * 63.546 + 1 * 207.2 + 1 * 28.0855 + 1 * 208.9804 + 1 * 24.305 + 1 * 58.933195 + 1 * 118.71 + 1 * 196.966569 =
2039.7283 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgAlAsAuBiCoCrCuFeHg2MgNiO7PbSb2SiSn

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, 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

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