Formula of Pyrophosphorous acid (H4O5P2)
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Chemical Formula | H4O5P2 |
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Molecular Weight | 145.976284 g/mol |
IUPAC Name | [(dihydroxyphosphanyl)oxy]phosphonous acid |
SMILES String | OP(O)OP(O)O |
InChI | InChI=1S/H4O5P2/c1-6(2)5-7(3)4/h1-4H |
InChIKey | ZJIPHXXDPROMEF-UHFFFAOYSA-N |
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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:
H4O5P2
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.

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- Name: ethanol
- CAS #: 64-17-5
- Formula: C2H5OH
- Smiles: CCO
- InChI: InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3
- InChIKey: LFQSCWFLJHTTHZ-UHFFFAOYSA-N
Additional Information for Identifying Pyrophosphorous acid Molecule
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Structure Data File (SDF/MOL File) of Pyrophosphorous acid
The structure data file (SDF/MOL File) of Pyrophosphorous acid is available for download in the SDF page of Pyrophosphorous acid providing the information about the atoms, bonds, connectivity and coordinates of Pyrophosphorous acid, which is not completely available in the chemical formula representation. The Pyrophosphorous acid structure data file can be imported to most of the cheminformatics software for further analysis and visualization.
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Chemical structure of Pyrophosphorous acid
The chemical structure image of Pyrophosphorous acid is available in chemical structure page of Pyrophosphorous acid, which specifies the molecular geometry, i.e., the spatial arrangement of atoms in the chemical formula of Pyrophosphorous acid and the chemical bonds that hold the atoms together.
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Molecular weight of Pyrophosphorous acid
The molecular weight of Pyrophosphorous acid is available in molecular weight page of Pyrophosphorous acid, which is calculated as the sum of the atomic weights of each constituent element multiplied by the number of atoms of that element specified in the chemical formula of Pyrophosphorous acid.
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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:
InChI=1S/H4O5P2/c1-6(2)5-7(3)4/h1-4H
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:
InChIKey=ZJIPHXXDPROMEF-UHFFFAOYSA-N
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.
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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? |
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H4O5P2 |
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? |
OP(O)OP(O)O |
What’s the InChI of Pyrophosphorous acid? |
InChI=1S/H4O5P2/c1-6(2)5-7(3)4/h1-4H |
What’s the InChIKey of Pyrophosphorous acid? |
ZJIPHXXDPROMEF-UHFFFAOYSA-N |