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You may want to reference (Pages 284 - 288) Section 7.8 while completing this problem.
Potassium and hydrogen react to form the ionic compound potassium hydride. Use data in Figures 7.10 and 7.12 to determine the energy change in kJ/mol for the following two reactions:
K(g) + H(g) → K+(g) + H–(g)
K(g) + H(g) → K–(g) + H+(g)