Iron(II) chloride is formed from the reaction between iron and copper(II) chloride. Fe plus CuCl sub 2 rightarrow FeCl sub 2 plus Cu If the reactants have triangle cap h sub f is equal to negative 256 kJ mol inverse and the products have triangle cap h sub f is equal to negative 321 kJ mol inverse , which reaction pathway graph would have a similar shape to this reaction?

The reactants have an enthalpy of −256 kJ/mol, and the products have an enthalpy of −321 kJ/mol. Since the products are 65 kJ/mol lower in energy (−321 − (−256) = −65), the reaction is exothermic: the graph should start at −256, rise over an activation-energy hump, and finish lower at −321. Choice B shows that pattern, with the reactants higher than the products.

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