Question

P -----> P205 -----> H3PO4 -----> Ca3 (PO4)2

Answer 1

4P+5O2=2P2O5
P2O5+3H2O=2H3PO4
2H3PO4 + 3Ca(OH)2 = Ca3(PO4)2↓ + 6H2O

Answer 2

4P+5O2=P4O10(тоже самое что и P2O5)
P2O5+3H2O=2H3PO4
2H3PO4+3CaO=Ca3(PO4)2 стрелка вниз+ 3H2O

Answer 3

This series of reactions describes the conversion of elemental phosphorus (P) into calcium phosphate (Ca3(PO4)2) via two intermediate compounds: P2O5 and H3PO4.

The first step is the oxidation of elemental phosphorus (P) to form phosphorus pentoxide (P2O5) according to the following reaction:

4P + 5O2 → 2P2O5

In the second step, phosphorus pentoxide (P2O5) reacts with water (H2O) to form phosphoric acid (H3PO4):

P2O5 + 3H2O → 2H3PO4

Finally, phosphoric acid (H3PO4) reacts with calcium hydroxide (Ca(OH)2) to form calcium phosphate (Ca3(PO4)2) and water (H2O):

2H3PO4 + 3Ca(OH)2 → Ca3(PO4)2 + 6H2O

Overall, the complete reaction can be written as:

4P + 5O2 + 6Ca(OH)2 → Ca3(PO4)2 + 6H2O