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Formula 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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Chemical Formula Description

The Pyrophosphorous acid molecule contains a total of 11 atom(s). There are 4 Hydrogen atom(s), 5 Oxygen atom(s), and 2 Phosphorous atom(s). A chemical formula of Pyrophosphorous acid can therefore be written as:


The chemical formula of Pyrophosphorous acid shown above is based on the molecular formula indicating the numbers of each type of atom in a molecule without structural information, which is different from the empirical formula which provides the numerical proportions of atoms of each type.

The above chemical formula is the basis of stoichiometry in chemical equations, i.e., the calculation of relative quantities of reactants and products in chemical reactions. The law of conservation of mass dictates that the quantity of each element given in the chemical formula does not change in a chemical reaction. Thus, each side of the chemical equation must represent the same quantity of any particular element based on the chemical formula.

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

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  • CAS #: 64-17-5
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  • InChI: InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3

Additional Information for Identifying Pyrophosphorous acid Molecule

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

    The molecular chemical formulas lack structural information. An alternative textual expression including the structural information is InChI. The full standard InChI of Pyrophosphorous acid is:


    It can provide a standard 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:


    The InChIKey may allow easier web searches for Pyrophosphorous acid, but it needs to be linked to the full InChI to get back to the original structure of the Pyrophosphorous acid since the full standard InChI cannot be reconstructed from the InChIKey.

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

    The Pyrophosphorous acid compound may have different names depending on the various different situations of industrial applications. The list of the other names (synonyms) of Pyrophosphorous acid including the registry numbers is given below, 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 chemical formula of Pyrophosphorous acid?
How many atoms and what are they in the Pyrophosphorous acid structure?
11 atom(s) - 4 Hydrogen atom(s), 5 Oxygen atom(s), and 2 Phosphorous atom(s)
How many chemical bonds and what are they 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 molecular weight of Pyrophosphorous acid?
145.976284 g/mol
What’s the SMILES string of Pyrophosphorous acid?
What’s the InChI of Pyrophosphorous acid?
What’s the InChIKey of Pyrophosphorous acid?