Phosphorus trichloride is formed when diphosphorus reacts with chlorine gas. The reaction equation is P₂ + 3 Cl₂ → 2 PCl₃. Calculate the ΔH for the reaction (in kcal and in kJ) using the bond dissociation energies in the table below.

• A. ΔH = –123 kcal; ΔH = –516 kJ
• B. ΔH = –123 kcal; ΔH = –133 kJ
• C. ΔH = –285 kcal; ΔH = –516 kJ
• D. ΔH = –285 kcal; ΔH = –133 kJ
• E. ΔH = –30 kcal; ΔH = –570 kJ