The Arrhenius parameters for the gas-phase decomposition of cyclobutane, C4H8(g) → 2 C2H4(g), are A = 4.00 × 1015 s−1 and Ea = 261 kJ mol−1. What is the half-life of cyclobutane at (i) 20 °C, (ii) 500 °C?

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