Question

What covalent compound is $P_4{\text{S}}_5$ ?

Answer 1

Hint: The compound mentioned in the question $P_4{\text{S}}_5$ is known as Tetra phosphorus Pentasulfide. It is a covalent molecule. It comes from a family of compounds known as phosphorus sulphides which contain only phosphorus and sulphur. The general formula for Phosphorus sulphide is $P_4{S}_x$ with $\text{x}⩽10$ .

Complete answer:
Tetra phosphorus Pentasulfide can be produced by reacting ${\text{P}}_4{\text{S}}_3$ which is known as Phosphorus sesquisulfide with sulphur in the solution of Carbon disulphide in the presence of light amount of iodine. Iodine is used as a catalyst here.

The Structure of this compound contains the arrangement of atoms and atoms are bonded to each other. all bonds are covalent bonds, tetra phosphorus Pentasulphide contains 11 non-H bonds, 11 multiple bonds, 11-aromatic bonds, 2 five-membered rings, 2 six membered rings, 2 seven-membered rings and 1 eight membered ring. The carbon atoms in tetra phosphorus Pentasulfide are located at the corners.
Tetra phosphorus Pentasulfide has a molecular mass of $284.2gmo{l}^{-1}$ . Tetra phosphorus Pentasulphide are appears to be a crystalline solid. it is yellow in colour it has a melting point of ${170}^{\circ }C$ . it has very high density of $2170Kg{m}^{-3}$ .Tetra phosphorus Pentasulfide is a Heterocyclic organic Compound.

Additional Information:
Phosphorous Penta sulphides have many applications. It is used as a lubricant in Zinc Dithiophosphate, it is used as a floating agent in the concentration of molybdenite minerals and it is used in production of pesticides.

Note:
Hydrogen atoms are not mentioned in the structure of tetra phosphorus Pentasulfide. To calculate hydrogen we need to remember each carbon atom is attached to sufficient hydrogen atoms to complete its covalency which is four.