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In the reaction AB(2)(I) + 2X(2) (g) hAr...

In the reaction `AB_(2)(I) + 2X_(2) (g) hArr AX_(2) (g) + BX_(2) (g) Delta H = -270` k cal per mol. Of `AB_(2) (I)` the enthalpies of formation of `AX_(2) (g)` & `BX_(2) (g)` are in the ratio of `4 : 3` and have opposite sign. The value of `Delta H_(f)^(0) (AB_(2)(I)) = + 30` k cal/mol. Then

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