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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of C9H11Cl3NO3PS (Chlorpyrifos) is 350.5863 g/mol

Convert between C9H11Cl3NO3PS weight and moles
CompoundMolesWeight, g
C9H11Cl3NO3PS

Elemental composition of C9H11Cl3NO3PS
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.0107930.8330
HydrogenH1.00794113.1625
ChlorineCl35.453330.3375
NitrogenN14.006713.9952
OxygenO15.9994313.6908
PhosphorusP30.97376218.8348
SulfurS32.06519.1461

Computing molar mass step by step

First, compute the number of each atom in C9H11Cl3NO3PS:
C: 9, H: 11, Cl: 3, N: 1, O: 3, P: 1, S: 1

Then, lookup atomic weights for each element in periodic table:
C: 12.0107, H: 1.00794, Cl: 35.453, N: 14.0067, O: 15.9994, P: 30.973762, S: 32.065

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (C9H11Cl3NO3PS) = ∑ Counti * Weighti =
Count(C) * Weight(C) + Count(H) * Weight(H) + Count(Cl) * Weight(Cl) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(S) * Weight(S) =
9 * 12.0107 + 11 * 1.00794 + 3 * 35.453 + 1 * 14.0067 + 3 * 15.9994 + 1 * 30.973762 + 1 * 32.065 =
350.5863 g/mol


Mass percent compositionAtomic percent composition

Chemical structure
C9H11Cl3NO3PS - Chemical structure

Appearance
Chlorpyrifos appears as a colorless to white crystalline solid.

Related compounds
FormulaCompound name
C9H10ClN2O5PSAzamethiphos
C14H17ClNO4PS2Dialifor
C12H14ClN2O3PSChlorphoxim
C12H15ClNO4PS2Phosalone
C14H13Cl2N2O2PSPhosacetim
C9H19Cl2N2O5PS2Mafosfamide

Formula in Hill system is C9H11Cl3NO3PS

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, 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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