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A student is studying the initial rate of decomposition of calcium carbonate by collecting the carbon dioxide gas that is released. The overall reaction is: CaCO3 (s) - > CaO (s) + CO2 (g) At a temperature of 245 °C the reaction gives off 44.0 mL of CO2 in the initial 20.0 seconds of the reaction. At a temperature of 181 °C, the reaction gives off 7.75 mL of CO2 in the initial 20.0 seconds of the reaction. Calculate the activation energy for the reaction.