some hypothetical reactions are given as 2 a2dg, Chemistry

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some hypothetical reactions are given as 2 a2dg

Some hypothetical reactions are given as 2 A2D(g) ---> 2 A2(g) + D2(g) , A2B3(g) ---> 2 A(g) + 3 B(g) , A(g) + B2(g) ---> AB2(g), 5 B(g) ---> B5(g) , B4(g) ---> 4 B(g) where all compounds are assumed as covalent then determine which reaction must be endothermic and also explain your answer briefly?

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Chemistry: some hypothetical reactions are given as 2 a2dg

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