Question 7

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A barium hydroxide solution, Ba(OH)2(aq), reacts with a nitric acid solution, HNO3(aq),  according to the following balanced equation: 

Ba(OH)2(aq) + 2HNO3(aq) → Ba(NO3)2(aq) + 2H2O(â„“) 

The potential energy graph below shows the change in potential energy for this reaction. 

7.1 Is this reaction ENDOTHERMIC or EXOTHERMIC? Give a reason for the  answer. (2) 

7.2 Use energy values A, B and C indicated on the graph and write down an  expression for each of the following: 

7.2.1 The energy of the activated complex (1)

7.2.2 The activation energy for the forward reaction (1)

7.2.3 ∆H for the reverse reaction (1) 

7.3 Calculate the amount of energy released during the reaction if 0,18 moles of  Ba(OH)2(aq) reacts completely with the acid. (3)

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