Question

P = P2O5 = Ca3(PO4)2 = Ca(H2PO4)2 = Ca3(PO4)2

Answer 1

4Р + 5О2 = 2Р2О5
P2O5 + 3CaO = Ca3(PO4)2 
Ca3(PO4)2 + 4H3PO4 = 3Ca(H2PO4)2↓
3Ca(H2PO4)2 = Ca3(PO4)2↓ + 4H3PO4

Answer 2

The chemical formulas you provided are for different compounds:

1. P2O5: This is the chemical formula for diphosphorus pentoxide, an oxide of phosphorus.

2. Ca3(PO4)2: This is the chemical formula for calcium phosphate, a compound commonly found in minerals and the main component of tooth enamel and bones.

3. Ca(H2PO4)2: This is the chemical formula for calcium dihydrogen phosphate, also known as monocalcium phosphate. It is often used as a food additive, a fertilizer, or a leavening agent in baking.

It seems there is an error in your statement. The correct chemical formula for calcium phosphate is Ca3(PO4)2, not Ca(H2PO4)2.