Consider the following thermochemical equations. PCl 5 (s) → PCl 3 (g) Cl 2 (g) Δ H ∘ rxn = 87.9 kJ mol 2 P (s) 3 Cl 2 (g) → 2 PCl 3 (g) Δ H ∘ rxn = − 574 kJ mol Using this data, determine the heat of formation for PCl 5 . Your answer should have three significant figures. Provide your answer below:
