(a) Use a spreadsheet program or graphing software and data at 1000. K and 1200. K from Table 5G.2 to plot the expression for the temperature dependence of ln K given by the dissociation of the diatomic halogens into the atoms, X₂ (g) ⇌ 2 X(g).

(b) From the graphs, determine the enthalpies and entropies of dissociation.

(c) Use these data to calculate the standard molar entropies of the gaseous halogen atoms X(g).

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TABLE 5G.2 Equilibrium Constants for Various Reactions T/K* Reaction H(g) + Cl(g) 2 HCl(g) H(g) + Br(g) 2 HBr(g) H(g) + 1(g) 2 HI(g) 2 BrCl(g) Br(g) + Cl(g) 2 HD (g) H(g) + D(g) 300 500 1000 300 500 1000 298 500 700 300 500 1000 100 500 1000 K 4.0 101 4.0 108 5.1 X 108 1.9 X 107 1.3 X 10 3.8 X 104 794 160 54 377 32 5 0.52 0.28 0.26 K 4.0 101 4.0 108 5.1 X 108 1.9 X 107 1.3 100 3.8 X 104 794 160 54 377 32 5 0.52 0.28 0.26