You wish to know the enthalpy change for the formation of liquid PCl 3 from the elements The enthalpy change for the formation of PCl 5 from the elements can be determined experimentally, as can the enthalpy change for the reaction of PCl 3 () with more chlorine to give PCl 5 (s) P4(s) 6 Cl(g) 4 PC...

Since the reaction produces 4 moles of PC13 we need to divide th ...

You wish to know the enthalpy change for the formation of liquid PCl 3 from the elements.

Question:

You wish to know the enthalpy change for the formation of liquid PCl₃ from the elements.

The enthalpy change for the formation of PCl₅ from the elements can be determined experimentally, as can the enthalpy change for the reaction of PCl₃(ℓ) with more chlorine to give PCl₅(s): P4(s) + 10 Cl(g) 4 PC15(s) A,H = -1774.0 kJ/mol-rxn PC13() + Cl(g) PCL5 (s) A,H = -123.8 kJ/mol-rxn