The reaction 2 NaHSO₄(s) Na₂ S₂O 7 (s) + H₂ O (g) is endothermic at 298 K. Therefore,

Question

Quizplus · Accepted Answer

A) Since the reaction is endothermic, heat is absorbed and the enthalpy change (DH) in the reaction is positive. B) According to Le Chatelier's principle, increasing the temperature will shift the equilibrium towards the side with higher enthalpy, which in this case is the reactant side. Therefore, the partial pressure of H₂O would be higher at 500K. C) The equilibrium constant (K) for this reaction is given by: K = [Na₂O]^7/[NaHSO₄]^2 [H₂O] Since the reaction is endothermic, increasing the temperature will shift the equilibrium towards the side with higher enthalpy, which in this case is the product side. Therefore, the concentration of Na₂O will increase, causing an increase in the numerator of the equilibrium constant. Hence, K would increase with increasing temperature. Therefore, choices A, B, and C are all correct, making option D the correct answer.

The Reaction 2 NaHSO₄(s) Na2 S2O 7 (S)

The Reaction 2 NaHSO₄(s) Na₂ S₂O 7 (S)