7. Energy, Rate and Equilibrium
Endothermic & Exothermic Reactions
If ΔH = —129.78 kcal/mol(—543 kJ/mol) and K = 1.22 at 25 °C for the formation of phosphoryl chloride from the reaction of phosphorus trichloride and oxygen gas,
2 PCl3(g) + O2(g) → 2 POCl3(g)
Is the reaction exothermic or endothermic?