what is the difference(in formula and properties) between Iron phosphorus and Iron phosphate?

Question

what is the difference(in formula and properties) between Iron phosphorus and Iron phosphate?

Answer 1

Assuming by iron phosphorus you mean iron phosphide, then it has the formula Fe₃P or Fe₂P.  It is a grey solid that is insoluble in water.

 

Iron(III) phosphate has the formula Fe₃PO_4.  It is a yellowish/brown solid that is soluble in water.

 

For additional properties, such as density, melting point, etc. you can just do a search of each and find the relevant  properties.