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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HeSiHOCSClHOSNCINCCaHeHfKLaDyRfXeBrUusUuo((C7H7O2S))NaCuCUCsFe is 2368.7515 g/mol

Convert between HeSiHOCSClHOSNCINCCaHeHfKLaDyRfXeBrUusUuo((C7H7O2S))NaCuCUCsFe weight and moles
CompoundMolesWeight, g
HeSiHOCSClHOSNCINCCaHeHfKLaDyRfXeBrUusUuo((C7H7O2S))NaCuCUCsFe

Elemental composition of HeSiHOCSClHOSNCINCCaHeHfKLaDyRfXeBrUusUuo((C7H7O2S))NaCuCUCsFe
ElementSymbolAtomic weightAtomsMass percent
HeliumHe4.00260220.3380
SiliconSi28.085511.1857
HydrogenH1.0079490.3830
OxygenO15.999442.7017
CarbonC12.0107115.5775
SulfurS32.06534.0610
ChlorineCl35.45311.4967
NitrogenN14.006721.1826
IodineI126.9044715.3574
CalciumCa40.07811.6919
HafniumHf178.4917.5352
PotassiumK39.098311.6506
LanthanumLa138.9054715.8641
DysprosiumDy162.50016.8602
RutherfordiumRf265.1167111.1923
XenonXe131.29315.5427
BromineBr79.90413.3733
TennessineUus292.208112.3359
OganessonUuo0.000000010.0000
SodiumNa22.9897692810.9705
CopperCu63.54612.6827
UraniumU238.02891110.0487
CesiumCs132.905451915.6108
IronFe55.84512.3576

Computing molar mass step by step

First, compute the number of each atom in HeSiHOCSClHOSNCINCCaHeHfKLaDyRfXeBrUusUuo((C7H7O2S))NaCuCUCsFe:
He: 2, Si: 1, H: 9, O: 4, C: 11, S: 3, Cl: 1, N: 2, I: 1, Ca: 1, Hf: 1, K: 1, La: 1, Dy: 1, Rf: 1, Xe: 1, Br: 1, Uus: 1, Uuo: 1, Na: 1, Cu: 1, U: 1, Cs: 1, Fe: 1

Then, lookup atomic weights for each element in periodic table:
He: 4.002602, Si: 28.0855, H: 1.00794, O: 15.9994, C: 12.0107, S: 32.065, Cl: 35.453, N: 14.0067, I: 126.90447, Ca: 40.078, Hf: 178.49, K: 39.0983, La: 138.90547, Dy: 162.5, Rf: 265.1167, Xe: 131.293, Br: 79.904, Uus: 292.20755, Uuo: 0, Na: 22.98976928, Cu: 63.546, U: 238.02891, Cs: 132.9054519, Fe: 55.845

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HeSiHOCSClHOSNCINCCaHeHfKLaDyRfXeBrUusUuo((C7H7O2S))NaCuCUCsFe) = ∑ Counti * Weighti =
Count(He) * Weight(He) + Count(Si) * Weight(Si) + Count(H) * Weight(H) + Count(O) * Weight(O) + Count(C) * Weight(C) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(N) * Weight(N) + Count(I) * Weight(I) + Count(Ca) * Weight(Ca) + Count(Hf) * Weight(Hf) + Count(K) * Weight(K) + Count(La) * Weight(La) + Count(Dy) * Weight(Dy) + Count(Rf) * Weight(Rf) + Count(Xe) * Weight(Xe) + Count(Br) * Weight(Br) + Count(Uus) * Weight(Uus) + Count(Uuo) * Weight(Uuo) + Count(Na) * Weight(Na) + Count(Cu) * Weight(Cu) + Count(U) * Weight(U) + Count(Cs) * Weight(Cs) + Count(Fe) * Weight(Fe) =
2 * 4.002602 + 1 * 28.0855 + 9 * 1.00794 + 4 * 15.9994 + 11 * 12.0107 + 3 * 32.065 + 1 * 35.453 + 2 * 14.0067 + 1 * 126.90447 + 1 * 40.078 + 1 * 178.49 + 1 * 39.0983 + 1 * 138.90547 + 1 * 162.5 + 1 * 265.1167 + 1 * 131.293 + 1 * 79.904 + 1 * 292.20755 + 1 * 0 + 1 * 22.98976928 + 1 * 63.546 + 1 * 238.02891 + 1 * 132.9054519 + 1 * 55.845 =
2368.7515 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C11H9BrCaClCsCuDyFeHe2HfIKLaN2NaO4RfS3SiUUuoUusXe

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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