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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of N2O5Au2S7Fe2K44Pt3PB8Ru4BI9PO2Ra9CO3H400Br5Kr3He28Ts5 is 9602.7695 g/mol

Convert between N2O5Au2S7Fe2K44Pt3PB8Ru4BI9PO2Ra9CO3H400Br5Kr3He28Ts5 weight and moles
CompoundMolesWeight, g
N2O5Au2S7Fe2K44Pt3PB8Ru4BI9PO2Ra9CO3H400Br5Kr3He28Ts5

Elemental composition of N2O5Au2S7Fe2K44Pt3PB8Ru4BI9PO2Ra9CO3H400Br5Kr3He28Ts5
ElementSymbolAtomic weightAtomsMass percent
NitrogenN14.006720.2917
OxygenO15.9994101.6661
GoldAu196.96656924.1023
SulfurS32.06572.3374
IronFe55.84521.1631
PotassiumK39.09834417.9149
PlatinumPt195.08436.0946
PhosphorusP30.97376220.6451
BoronB10.81191.0132
RutheniumRu101.0744.2100
IodineI126.90447911.8939
RadiumRa226.025410921.1838
CarbonC12.010710.1251
HydrogenH1.007944004.1985
BromineBr79.90454.1605
KryptonKr83.79832.6179
HeliumHe4.002602281.1671
TennessineTs292.208515.2148

Computing molar mass step by step

First, compute the number of each atom in N2O5Au2S7Fe2K44Pt3PB8Ru4BI9PO2Ra9CO3H400Br5Kr3He28Ts5:
N: 2, O: 10, Au: 2, S: 7, Fe: 2, K: 44, Pt: 3, P: 2, B: 9, Ru: 4, I: 9, Ra: 9, C: 1, H: 400, Br: 5, Kr: 3, He: 28, Ts: 5

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, P: 30.973762, B: 10.811, Ru: 101.07, I: 126.90447, Ra: 226.0254098, C: 12.0107, H: 1.00794, Br: 79.904, Kr: 83.798, He: 4.002602, Ts: 292.20755

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (N2O5Au2S7Fe2K44Pt3PB8Ru4BI9PO2Ra9CO3H400Br5Kr3He28Ts5) = ∑ 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(P) * Weight(P) + Count(B) * Weight(B) + Count(Ru) * Weight(Ru) + Count(I) * Weight(I) + Count(Ra) * Weight(Ra) + Count(C) * Weight(C) + Count(H) * Weight(H) + Count(Br) * Weight(Br) + Count(Kr) * Weight(Kr) + Count(He) * Weight(He) + Count(Ts) * Weight(Ts) =
2 * 14.0067 + 10 * 15.9994 + 2 * 196.966569 + 7 * 32.065 + 2 * 55.845 + 44 * 39.0983 + 3 * 195.084 + 2 * 30.973762 + 9 * 10.811 + 4 * 101.07 + 9 * 126.90447 + 9 * 226.0254098 + 1 * 12.0107 + 400 * 1.00794 + 5 * 79.904 + 3 * 83.798 + 28 * 4.002602 + 5 * 292.20755 =
9602.7695 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CH400Au2B9Br5Fe2He28I9K44Kr3N2O10P2Pt3Ra9Ru4S7Ts5

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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