For the reaction N ₂+3 X ₂ 2 NX ₃ where X = F , Cl (the average bond energies are F - F =155 ~kJ ~mol ⁻¹, ~N - F =272 ~kJ ~mol ⁻¹, Cl - Cl kJ mol ⁻¹, ~N - Cl kJ mol ⁻¹ and N N =941 kJmol ⁻¹ ). The heats of formation of NF ₃ and NCl ₃ in kJ

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For the reaction N ₂+3 X ₂ 2 NX ₃ where X = F , Cl (the average bond energies are F - F =155 ~kJ ~mol ⁻¹, ~N - F =272 ~kJ ~mol ⁻¹, Cl - Cl kJ mol ⁻¹, ~N - Cl kJ mol ⁻¹ and N N =941 kJmol ⁻¹ ). The heats of formation of NF ₃ and NCl ₃ in kJ mol ⁻¹ , respectively, are closest to

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Correct answer: A. -226 and +467

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