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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H85He32SC3Rh1Zn4C17Li23Be21Tc3Na11Mg12K14Ca14 is 3143.0962 g/mol

Convert between H85He32SC3Rh1Zn4C17Li23Be21Tc3Na11Mg12K14Ca14 weight and moles
CompoundMolesWeight, g
H85He32SC3Rh1Zn4C17Li23Be21Tc3Na11Mg12K14Ca14

Elemental composition of H85He32SC3Rh1Zn4C17Li23Be21Tc3Na11Mg12K14Ca14
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.00794852.7258
HeliumHe4.002602324.0751
SulfurS32.06511.0202
CarbonC12.0107207.6426
RhodiumRh102.9055013.2740
ZincZn65.3848.3205
LithiumLi6.941235.0792
BerylliumBe9.012182216.0213
TechnetiumTc96.90636539.2494
SodiumNa22.98976928118.0458
MagnesiumMg24.3050129.2794
PotassiumK39.09831417.4152
CalciumCa40.0781417.8516

Computing molar mass step by step

First, compute the number of each atom in H85He32SC3Rh1Zn4C17Li23Be21Tc3Na11Mg12K14Ca14:
H: 85, He: 32, S: 1, C: 20, Rh: 1, Zn: 4, Li: 23, Be: 21, Tc: 3, Na: 11, Mg: 12, K: 14, Ca: 14

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, S: 32.065, C: 12.0107, Rh: 102.9055, Zn: 65.38, Li: 6.941, Be: 9.012182, Tc: 96.906365, Na: 22.98976928, Mg: 24.305, K: 39.0983, Ca: 40.078

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (H85He32SC3Rh1Zn4C17Li23Be21Tc3Na11Mg12K14Ca14) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(S) * Weight(S) + Count(C) * Weight(C) + Count(Rh) * Weight(Rh) + Count(Zn) * Weight(Zn) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(Tc) * Weight(Tc) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) =
85 * 1.00794 + 32 * 4.002602 + 1 * 32.065 + 20 * 12.0107 + 1 * 102.9055 + 4 * 65.38 + 23 * 6.941 + 21 * 9.012182 + 3 * 96.906365 + 11 * 22.98976928 + 12 * 24.305 + 14 * 39.0983 + 14 * 40.078 =
3143.0962 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C20H85Be21Ca14He32K14Li23Mg12Na11RhSTc3Zn4

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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