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Molecular Weight of Pyrophosphorous acid (H4O5P2)

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2D chemical structure image of Pyrophosphorous acid
Chemical Formula H4O5P2
Molecular Weight 145.976284 g/mol
IUPAC Name [(dihydroxyphosphanyl)oxy]phosphonous acid
InChI InChI=1S/H4O5P2/c1-6(2)5-7(3)4/h1-4H
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Molecular Weight Description

The Pyrophosphorous acid molecule consists of 4 Hydrogen atom(s), 5 Oxygen atom(s), and 2 Phosphorous atom(s) - a total of 11 atom(s). The molecular weight of Pyrophosphorous acid is determined by the sum of the atomic weights of each constituent element multiplied by the number of atoms, which is calculated to be:

$$ 145.976284 · \frac{g}{mol} $$

The exact term of the above molecular weight is “molar mass”, which is based on the atomic mass of each element. Molecular weight is actually an older term of “relative molar mass” or “molecular mass”, which is a dimensionless quantity equal to the molar mass divided by the molar mass constant defined by 1 g/mol.

Molecular masses are calculated from the standard atomic weights of each nuclide, while molar masses are calculated from the atomic mass of each element. The atomic mass takes into account the isotopic distribution of the element in a given sample.

3D chemical structure image of Pyrophosphorous acid
Ball-and-stick model of Pyrophosphorous acid

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  • Name: ethanol
  • CAS #: 64-17-5
  • Formula: C2H5OH
  • Smiles: CCO
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Additional Information for Identifying Pyrophosphorous acid Molecule

  • InChI (IUPAC International Chemical Identifier) information of Pyrophosphorous acid

    In addition to the molecular weight information, the structural information of Pyrophosphorous acid in a textual expression is available via InChi. The full standard InChI of Pyrophosphorous acid is given below:


    It can provide a way to encode the molecular information of Pyrophosphorous acid to facilitate the search for the compound information in databases and on the web.

    The condensed, 27 character standard InChIKey (hashed version of the full standard InChI) of Pyrophosphorous acid is:


    It may allow easier web searches for Pyrophosphorous acid. The InChIKey, however, needs to be linked to the full InChI as well in order to get back to the original structure of the Pyrophosphorous acid as the full standard InChI cannot be reconstructed from the InChIKey.

  • Other names (synonyms) or registry numbers of Pyrophosphorous acid

    There may be different names of the Pyrophosphorous acid compound depending on the various situations of industrial applications, which are given below including the registry numbers if available:

    • dihydroxyphosphanyl dihydrogen phosphite
    • Oxybis(phosphonous acid)
    • 13445-56-2
    • W4W7JY3ELM
    • Diphosphorous acid
    • Pyrophosphorous acid

Pyrophosphorous acid Identification Summary Frequently Asked Questions (FAQs)

What’s the formula of Pyrophosphorous acid?
How many atoms and what are the elements in the Pyrophosphorous acid molecule?
11 atom(s) - 4 Hydrogen atom(s), 5 Oxygen atom(s), and 2 Phosphorous atom(s)
How many chemical bonds and what types of bonds are in the Pyrophosphorous acid structure?
10 bond(s) - 6 non-H bond(s), 2 rotatable bond(s), 4 hydroxyl group(s), and 2 phosphite(s)/thiophosphite(s)
What’s the molar mass of Pyrophosphorous acid?
145.976284 g/mol
What’s the SMILES format of Pyrophosphorous acid?
What’s the InChI format of Pyrophosphorous acid?
What’s the InChIKey string of Pyrophosphorous acid?