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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Li2Be5C10NI1000B100V10000Zr10Mo1000W10O100CU10000F12Ga3I100Y is 3131421.8200 g/mol

Convert between Li2Be5C10NI1000B100V10000Zr10Mo1000W10O100CU10000F12Ga3I100Y weight and moles
CompoundMolesWeight, g
Li2Be5C10NI1000B100V10000Zr10Mo1000W10O100CU10000F12Ga3I100Y

Elemental composition of Li2Be5C10NI1000B100V10000Zr10Mo1000W10O100CU10000F12Ga3I100Y
ElementSymbolAtomic weightAtomsMass percent
LithiumLi6.94120.0004
BerylliumBe9.01218250.0014
CarbonC12.0107110.0042
NitrogenN14.006710.0004
IodineI126.9044711004.4579
BoronB10.8111000.0345
VanadiumV50.94151000016.2678
ZirconiumZr91.224100.0291
MolybdenumMo95.9610003.0644
TungstenW183.84100.0587
OxygenO15.99941000.0511
UraniumU238.028911000076.0130
FluorineF18.9984032120.0073
GalliumGa69.72330.0067
YttriumY88.9058510.0028

Computing molar mass step by step

First, compute the number of each atom in Li2Be5C10NI1000B100V10000Zr10Mo1000W10O100CU10000F12Ga3I100Y:
Li: 2, Be: 5, C: 11, N: 1, I: 1100, B: 100, V: 10000, Zr: 10, Mo: 1000, W: 10, O: 100, U: 10000, F: 12, Ga: 3, Y: 1

Then, lookup atomic weights for each element in periodic table:
Li: 6.941, Be: 9.012182, C: 12.0107, N: 14.0067, I: 126.90447, B: 10.811, V: 50.9415, Zr: 91.224, Mo: 95.96, W: 183.84, O: 15.9994, U: 238.02891, F: 18.9984032, Ga: 69.723, Y: 88.90585

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (Li2Be5C10NI1000B100V10000Zr10Mo1000W10O100CU10000F12Ga3I100Y) = ∑ Counti * Weighti =
Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(I) * Weight(I) + Count(B) * Weight(B) + Count(V) * Weight(V) + Count(Zr) * Weight(Zr) + Count(Mo) * Weight(Mo) + Count(W) * Weight(W) + Count(O) * Weight(O) + Count(U) * Weight(U) + Count(F) * Weight(F) + Count(Ga) * Weight(Ga) + Count(Y) * Weight(Y) =
2 * 6.941 + 5 * 9.012182 + 11 * 12.0107 + 1 * 14.0067 + 1100 * 126.90447 + 100 * 10.811 + 10000 * 50.9415 + 10 * 91.224 + 1000 * 95.96 + 10 * 183.84 + 100 * 15.9994 + 10000 * 238.02891 + 12 * 18.9984032 + 3 * 69.723 + 1 * 88.90585 =
3131421.8200 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C11B100Be5F12Ga3I1100Li2Mo1000NO100U10000V10000W10YZr10

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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