CHEMISTRY For the reaction N_2 + 3X_2 →2NX_3 where X = F, Cl (the average bond energies are F-F = 155 kJ mol^{–1} N-F = 272 kJ mol^{–1} , Cl-Cl = 242 kJ mol^{–1} , N-Cl = 200 kJ mol^{–1} and N ≡ N = 941 kJ mol^{–1} ), the heats of formation of NF_3 and NCl_3 in kJ mol^{–1} , respectively, are closest to

Question

CHEMISTRY  For the reaction N_2 + 3X_2 →2NX_3 where X = F, Cl (the average bond energies are F-F = 155 kJ mol^{–1}  N-F = 272 kJ mol^{–1} , Cl-Cl = 242 kJ mol^{–1} , N-Cl = 200 kJ mol^{–1}  and N ≡ N = 941 kJ mol^{–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 is :  – 226 and +467

KVPY SX SB Exam 2015 Question Paper