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La entalpa estndar de formacin de fluoruro de bario, BaF2(s) es -1207 kJ mol-1. Todas estas reacciones se encuentran en un ciclo de Born-Haber para

La entalpa estndar de formacin de fluoruro de bario, BaF2(s) es -1207 kJ mol-1. Todas estas reacciones se encuentran en un ciclo de Born-Haber para BaF2(s). Qu reaccin tiene un cambio de entalpa que es exotrmico?

(A) Ba(g) Ba+(g)

(B) Ba(s) Ba(g)

(C) BaF2(s) Ba2+(g) + 2 F(g)

(D) Ba2+(g) + 2 F(g) BaF2(s)

(E) BaF2(s) Ba(s) + F2(g)

La respuesta es D, pero cmo lo sabes?

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