Consider the following endothermic reaction: PCl ₅( g ) PCl ₃( g ) + Cl ₂( g ) The number of factors which will increase the yield of PCl ₃ at equilibrium from the following is _____ . A. Decreasing temperature B. Increasing pressure C. Addition of inert gas at constant pressure D. Addition of more PCl ₅ E. Addition of inert gas at constant volume

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The given reaction is endothermic ( H > 0 ) and has a positive change in gaseous moles, n_g = 1 + 1 - 1 = 1 > 0 . According to Le Chatelier's principle: A. Decreasing temperature favours the exothermic direction, shifting the equilibrium backward. B. Increasing pressure favours the direction with fewer gaseous moles, shifting the equilibrium backward. C. Addition of inert gas at constant pressure increases the total volume, which favours the direction with more gaseous moles, shifting the equilibrium forward. D. Ad