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Consider the reaction: (i) A(2)(s)+B(2...

Consider the reaction:
(i) `A_(2)(s)+B_(2)(g)toA_(2)(g)+B_(2)(g),DeltaH=-x` kJ
(ii) `A_(2)(g)+B_(2)(g)to2AB(g),DeltaH=-y` kJ
What is the value of the change in enthalpy for the following reaction `A_(2)(s)+B_(2)(g)to2AB(g)` ?

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`-(x+y)kJ`.
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