Determine the enthalpy of formation (ΔH) for the formation of phosphorus trichloride:
P₄ (s) + 6 Cl₂ (g) → 4 PCl₃ (g)

P₄ (s) = -17.46 kJ/mol
PCl₃ (g) = -288.07 kJ/mol
PCl₃ (l) = -319.6 kJ/mol
Cl₂ (g) = 0.0 kJ/mol