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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Ru2Mn9(Cr3Hf6)ReIrAu4(H2O5)V8Tc3Ca3(Po4)S4At3K4(Li2Na5)Ba3Sc is 6326.6111 g/mol

Convert between Ru2Mn9(Cr3Hf6)ReIrAu4(H2O5)V8Tc3Ca3(Po4)S4At3K4(Li2Na5)Ba3Sc weight and moles
CompoundMolesWeight, g
Ru2Mn9(Cr3Hf6)ReIrAu4(H2O5)V8Tc3Ca3(Po4)S4At3K4(Li2Na5)Ba3Sc

Elemental composition of Ru2Mn9(Cr3Hf6)ReIrAu4(H2O5)V8Tc3Ca3(Po4)S4At3K4(Li2Na5)Ba3Sc
ElementSymbolAtomic weightAtomsMass percent
RutheniumRu101.0723.1951
ManganeseMn54.93804597.8153
RheniumRe186.20712.9432
IridiumIr192.21713.0382
GoldAu196.966569412.4532
VanadiumV50.941586.4416
TechnetiumTc96.90636534.5952
CalciumCa40.07831.9004
SulfurS32.06542.0273
AstatineAt209.98714839.9573
PotassiumK39.098342.4720
BariumBa137.32736.5119
ScandiumSc44.95591210.7106
LithiumLi6.94120.2194
SodiumNa22.9897692851.8169
PoloniumPo208.982430413.2129
HydrogenH1.0079420.0319
OxygenO15.999451.2645
ChromiumCr51.996132.4656
HafniumHf178.49616.9275

Computing molar mass step by step

First, compute the number of each atom in Ru2Mn9(Cr3Hf6)ReIrAu4(H2O5)V8Tc3Ca3(Po4)S4At3K4(Li2Na5)Ba3Sc:
Ru: 2, Mn: 9, Re: 1, Ir: 1, Au: 4, V: 8, Tc: 3, Ca: 3, S: 4, At: 3, K: 4, Ba: 3, Sc: 1, Li: 2, Na: 5, Po: 4, H: 2, O: 5, Cr: 3, Hf: 6

Then, lookup atomic weights for each element in periodic table:
Ru: 101.07, Mn: 54.938045, Re: 186.207, Ir: 192.217, Au: 196.966569, V: 50.9415, Tc: 96.906365, Ca: 40.078, S: 32.065, At: 209.987148, K: 39.0983, Ba: 137.327, Sc: 44.955912, Li: 6.941, Na: 22.98976928, Po: 208.9824304, H: 1.00794, O: 15.9994, Cr: 51.9961, Hf: 178.49

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (Ru2Mn9(Cr3Hf6)ReIrAu4(H2O5)V8Tc3Ca3(Po4)S4At3K4(Li2Na5)Ba3Sc) = ∑ Counti * Weighti =
Count(Ru) * Weight(Ru) + Count(Mn) * Weight(Mn) + Count(Re) * Weight(Re) + Count(Ir) * Weight(Ir) + Count(Au) * Weight(Au) + Count(V) * Weight(V) + Count(Tc) * Weight(Tc) + Count(Ca) * Weight(Ca) + Count(S) * Weight(S) + Count(At) * Weight(At) + Count(K) * Weight(K) + Count(Ba) * Weight(Ba) + Count(Sc) * Weight(Sc) + Count(Li) * Weight(Li) + Count(Na) * Weight(Na) + Count(Po) * Weight(Po) + Count(H) * Weight(H) + Count(O) * Weight(O) + Count(Cr) * Weight(Cr) + Count(Hf) * Weight(Hf) =
2 * 101.07 + 9 * 54.938045 + 1 * 186.207 + 1 * 192.217 + 4 * 196.966569 + 8 * 50.9415 + 3 * 96.906365 + 3 * 40.078 + 4 * 32.065 + 3 * 209.987148 + 4 * 39.0983 + 3 * 137.327 + 1 * 44.955912 + 2 * 6.941 + 5 * 22.98976928 + 4 * 208.9824304 + 2 * 1.00794 + 5 * 15.9994 + 3 * 51.9961 + 6 * 178.49 =
6326.6111 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is At3Au4Ba3Ca3Cr3H2Hf6IrK4Li2Mn9Na5O5Po4ReRu2S4ScTc3V8

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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