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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of C12H22O11NaNO3K2SO4Al2(SO4)3MnCl2KOHPBiAsU is 1678.5556 g/mol

Convert between C12H22O11NaNO3K2SO4Al2(SO4)3MnCl2KOHPBiAsU weight and moles
CompoundMolesWeight, g
C12H22O11NaNO3K2SO4Al2(SO4)3MnCl2KOHPBiAsU

Elemental composition of C12H22O11NaNO3K2SO4Al2(SO4)3MnCl2KOHPBiAsU
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.0107128.5865
HydrogenH1.00794231.3811
OxygenO15.99943129.5481
SodiumNa22.9897692811.3696
NitrogenN14.006710.8344
PotassiumK39.098336.9878
SulfurS32.06547.6411
AluminumAl26.981538623.2149
ManganeseMn54.93804513.2729
ChlorineCl35.45324.2242
PhosphorusP30.97376211.8453
BismuthBi208.98040112.4500
ArsenicAs74.9216014.4635
UraniumU238.02891114.1806

Computing molar mass step by step

First, compute the number of each atom in C12H22O11NaNO3K2SO4Al2(SO4)3MnCl2KOHPBiAsU:
C: 12, H: 23, O: 31, Na: 1, N: 1, K: 3, S: 4, Al: 2, Mn: 1, Cl: 2, P: 1, Bi: 1, As: 1, U: 1

Then, lookup atomic weights for each element in periodic table:
C: 12.0107, H: 1.00794, O: 15.9994, Na: 22.98976928, N: 14.0067, K: 39.0983, S: 32.065, Al: 26.9815386, Mn: 54.938045, Cl: 35.453, P: 30.973762, Bi: 208.9804, As: 74.9216, U: 238.02891

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (C12H22O11NaNO3K2SO4Al2(SO4)3MnCl2KOHPBiAsU) = ∑ Counti * Weighti =
Count(C) * Weight(C) + Count(H) * Weight(H) + Count(O) * Weight(O) + Count(Na) * Weight(Na) + Count(N) * Weight(N) + Count(K) * Weight(K) + Count(S) * Weight(S) + Count(Al) * Weight(Al) + Count(Mn) * Weight(Mn) + Count(Cl) * Weight(Cl) + Count(P) * Weight(P) + Count(Bi) * Weight(Bi) + Count(As) * Weight(As) + Count(U) * Weight(U) =
12 * 12.0107 + 23 * 1.00794 + 31 * 15.9994 + 1 * 22.98976928 + 1 * 14.0067 + 3 * 39.0983 + 4 * 32.065 + 2 * 26.9815386 + 1 * 54.938045 + 2 * 35.453 + 1 * 30.973762 + 1 * 208.9804 + 1 * 74.9216 + 1 * 238.02891 =
1678.5556 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C12H23Al2AsBiCl2K3MnNNaO31PS4U

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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