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Without doing any calculations, predict the sign of ∆H for each of the following reactions: (a)...

Without doing any calculations, predict the sign of ∆H for each of the following reactions:

(a) 2 NO2 (g) -> N2O4 (g)

(b) 2 F (g) -> F2 (g)

(c) Mg^2+ (g) +2 Cl^- (g) -> MgCl2 (s)

(d) HBr (g) -> H (g) + Br (g)

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