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The arrhenius parameters for the gas-phase decomposition of cycolbutane, C4H8 -> 2C2H4 are A = 4x10^15...

The arrhenius parameters for the gas-phase decomposition of cycolbutane, C4H8 -> 2C2H4 are A = 4x10^15 s^-1 and Ea = 261 kJ/mol. What is the half-life of cyclobutane at i) 20 C ii) 500 C?

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