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12) The first-order isomerization reaction: cyclopropane →propene, has a rate constant of 1.10 × 10-4 s-1 at 470°C and 5.70 × 10-4 s-1 at 500°C. What is the activation energy, Ea, for the reaction? A) 380 kJ/mol B) 46 kJ/mol C) 260 kJ/mol D) 110 kJ/mol