Question: Using data from Table 5G.2 and standard graphing software, determine the standard enthalpy and entropy of the reaction N 2 O 4 (g) 2

Using data from Table 5G.2 and standard graphing software, determine the standard enthalpy and entropy of the reaction N₂O₄(g) → 2 NO₂(g) and estimate the N—N bond enthalpy in N₂O₄. How does this value compare with the mean N—N bond enthalpy in Table 4E.3?

TABLE 4E.3 Mean Bond Enthalpies AHB/(kJ. mol) Bond C-H C-C C=C CC* C-F C-CI C-Br 412 348 612 518 837 360 743 TABLE 5G.2 Equilibrium Constants for Various Reactions T/K* Reaction H(g) + Cl(g) 2 HCl(g) H(g) + Br(g) 2

F(g) = 2 F(g) Cl(g) 2 Cl(g) Br(g) 2 Br(g) 1(g) = 2 I(g) N(g) + 3 H(g) = 2 NH3(g) 2 SO(g) + O(g) 2 SO3(g)

TABLE 4E.3 Mean Bond Enthalpies AHB/(kJ. mol) Bond C-H C-C C=C CC* C-F C-CI C-Br 412 348 612 518 837 360 743 305 484 338 276 Bond C-I N-H N-N N=N N-O N=O N-F N-Cl O-H 0-0 AHB/(kJ.mol-) 238 388 163 409 210. 630. 270. 200. 463 157

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