Analyse energy profile diagrams for reactions with and without catalysts, to determine the enthalpy change and activation energy.

An energy profile diagram is provided for the reaction: \(2\text{NO}_2\text{Cl}(g) \rightarrow 2\text{NO}_2(g) + \text{Cl}_2(g)\) The diagram shows both the uncatalysed pathway and the catalysed pathway. Determine: (a) the enthalpy change (\(\Delta H\)) for the reaction. (1 mark) (b) the activation energy (\(E_\text{a}\)) for the catalysed pathway. (1 mark)

Determine the activation energy for the catalysed forward reaction.