P+HNO3(конц.)=H3PO4+NO2+H2O

The reaction you're referring to involves phosphoric acid (H₃PO₄) being formed from phosphorus (P) and concentrated nitric acid (HNO₃). This is a redox reaction where phosphorus is oxidized and the nitric acid is reduced.

The balanced equation for the reaction is:

\[ P + 5 HNO_3 \rightarrow H_3PO_4 + 5 NO_2 + 2 H_2O \]

In this reaction:

• Phosphorus (P) is oxidized to phosphoric acid (H₃PO₄).
• The nitric acid (HNO₃) is reduced to nitrogen dioxide (NO₂) and also produces water (H₂O).

Make sure to understand the stoichiometry and the oxidation states of the elements involved when studying this reaction, as it showcases both redox processes and synthesis reactions. If you have any specific questions about the reaction or need further information, feel free to ask!