Write the reaction equations: P- P2O5- H3PO4- H2

To carry out the above chain of transformations, it is necessary to carry out the following reactions:

We add oxygen to phosphorus, as a result of the reaction, pentavalent phosphorus oxide is obtained.

4 P + 5 O2 = 2 P2O5

We add water to the pentavalent phosphorus oxide, as a result of the reaction, orthophosphoric acid is formed.

3 P2O5 + 3 H2O = 2 H3PO4

The third reaction of the decomposition of phosphoric acid

2 H3PO4 = 3 H2O + P2O5

And the fourth reaction is the decomposition of water into its component parts.

2 H2O = 2 H2 + O2