Overall reaction The reactions for the ionization energy of potassium and the el

Question

Overall reaction

The reactions for the ionization energy of potassium and the electron affinity of bromine can be combined to give the reaction shown in the introduction:

K(g)Br(g)+e?K(g)+Br(g)???K+(g)+e?Br?(g)K+(g)+Br?(g)

Part C

The ionization energy for potassium is 419 kJ/mol. The electron affinity for bromine is -325 kJ/mol. Use these values and Hess's law to calculate the enthalpy for the following reaction per mole of reagent:

K(g)+Br(g)?K+(g)+Br?(g),      ?H=?

Express your answer with the appropriate units.

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Explanation / Answer

Enthalpy change = (419-325) kJ/mol = 94 kJ/mol

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