The heat of formation of gaseous methane is -17.9 kcal mol-¹. Knowing that the C-H and H-H bond energies are 98.7 and 104.2 kcal mol-¹, respectively, calculate the heat of sublimation of graphite, corresponding to the following physical change: C(s) → C(g) Answer: 168.5 kcal mol-¹

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A:

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A: Answer:Here:

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