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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of N2O5Au2S7Fe2K44Pt3Pb8Ru4Bi9Po2Ra9Co3H400Br5Kr3He28Ar6P4 is 11245.1084 g/mol

Convert between N2O5Au2S7Fe2K44Pt3Pb8Ru4Bi9Po2Ra9Co3H400Br5Kr3He28Ar6P4 weight and moles
CompoundMolesWeight, g
N2O5Au2S7Fe2K44Pt3Pb8Ru4Bi9Po2Ra9Co3H400Br5Kr3He28Ar6P4

Elemental composition of N2O5Au2S7Fe2K44Pt3Pb8Ru4Bi9Po2Ra9Co3H400Br5Kr3He28Ar6P4
ElementSymbolAtomic weightAtomsMass percent
NitrogenN14.006720.2491
OxygenO15.999450.7114
GoldAu196.96656923.5032
SulfurS32.06571.9960
IronFe55.84520.9932
PotassiumK39.09834415.2984
PlatinumPt195.08435.2045
LeadPb207.2814.7406
RutheniumRu101.0743.5952
BismuthBi208.98040916.7257
PoloniumPo208.98243023.7169
RadiumRa226.025410918.0899
CobaltCo58.93319531.5722
HydrogenH1.007944003.5853
BromineBr79.90453.5528
KryptonKr83.79832.2356
HeliumHe4.002602280.9966
ArgonAr39.94862.1315
PhosphorusP30.97376241.1018

Computing molar mass step by step

First, compute the number of each atom in N2O5Au2S7Fe2K44Pt3Pb8Ru4Bi9Po2Ra9Co3H400Br5Kr3He28Ar6P4:
N: 2, O: 5, Au: 2, S: 7, Fe: 2, K: 44, Pt: 3, Pb: 8, Ru: 4, Bi: 9, Po: 2, Ra: 9, Co: 3, H: 400, Br: 5, Kr: 3, He: 28, Ar: 6, P: 4

Then, lookup atomic weights for each element in periodic table:
N: 14.0067, O: 15.9994, Au: 196.966569, S: 32.065, Fe: 55.845, K: 39.0983, Pt: 195.084, Pb: 207.2, Ru: 101.07, Bi: 208.9804, Po: 208.9824304, Ra: 226.0254098, Co: 58.933195, H: 1.00794, Br: 79.904, Kr: 83.798, He: 4.002602, Ar: 39.948, P: 30.973762

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (N2O5Au2S7Fe2K44Pt3Pb8Ru4Bi9Po2Ra9Co3H400Br5Kr3He28Ar6P4) = ∑ Counti * Weighti =
Count(N) * Weight(N) + Count(O) * Weight(O) + Count(Au) * Weight(Au) + Count(S) * Weight(S) + Count(Fe) * Weight(Fe) + Count(K) * Weight(K) + Count(Pt) * Weight(Pt) + Count(Pb) * Weight(Pb) + Count(Ru) * Weight(Ru) + Count(Bi) * Weight(Bi) + Count(Po) * Weight(Po) + Count(Ra) * Weight(Ra) + Count(Co) * Weight(Co) + Count(H) * Weight(H) + Count(Br) * Weight(Br) + Count(Kr) * Weight(Kr) + Count(He) * Weight(He) + Count(Ar) * Weight(Ar) + Count(P) * Weight(P) =
2 * 14.0067 + 5 * 15.9994 + 2 * 196.966569 + 7 * 32.065 + 2 * 55.845 + 44 * 39.0983 + 3 * 195.084 + 8 * 207.2 + 4 * 101.07 + 9 * 208.9804 + 2 * 208.9824304 + 9 * 226.0254098 + 3 * 58.933195 + 400 * 1.00794 + 5 * 79.904 + 3 * 83.798 + 28 * 4.002602 + 6 * 39.948 + 4 * 30.973762 =
11245.1084 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is Ar6Au2Bi9Br5Co3Fe2H400He28K44Kr3N2O5P4Pb8Po2Pt3Ra9Ru4S7

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

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