Question

P→Mg3P2→PH3→P2O5→H3PO4

Answer 1

1) 2P + 3Mg = Mg3P2;

2) Mg3P2 + 6H2O = 3Mg(OH)2 + 2PH3;

3) 2PH3 + 4O2(изб.) = P2O5 + 3H2O;

4) P2O5 + 3H2O = 2H3PO4;

Answer 2

It appears you've provided a sequence of chemical reactions involving different compounds containing phosphorus (P) and other elements. Let's break down each step of the reaction sequence:

1. P → This likely represents an initial reactant containing phosphorus, but the specific compound is not mentioned.

2. Mg3P2 → This represents the compound magnesium phosphide (Mg3P2), which contains magnesium (Mg) and phosphorus (P).

3. PH3 → This represents phosphine (PH3), a compound containing phosphorus and hydrogen.

4. P2O5 → This represents diphosphorus pentoxide (P2O5), a compound composed of two phosphorus atoms and five oxygen atoms.

5. H3PO4 → This represents phosphoric acid (H3PO4), a compound containing phosphorus, hydrogen, and oxygen.

It appears you are describing a series of chemical reactions, but you haven't provided the specific details of the reactions themselves, such as reaction conditions, reactant amounts, or reaction mechanisms. Chemical reactions involve the transformation of reactants into products through the breaking and forming of chemical bonds, and the specific conditions can greatly affect the outcomes.

If you have a specific question about any of these reactions or need more information about them, please provide additional details, and I'd be happy to assist you further.