This question has multiple parts A chemical reaction is written as: H2(g)+Br2(g)->2 HBr(s); Delta*H = - 72.6kJ Based on this information ... (a) Is the reaction endothermic or exothermic? How do you know? (b) If we add Br 2 (g) to the reaction at equilibrium will the reaction shift to the right to the left, or not change? How do you know? () Write its equilibrium constant expression (Keg )

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