Consider the first-order reaction C₂H6 → 2 CH3 at 500°C where its half-life is 21 minutes. (a) How long does it take for the concentration of C₂H6 to drop from 6.6 mM to 3.1 mm? 4.0 23 min From 3.1 mM to 1.8 mm? 4.0 17 min (b) If the original concentration of ethane is 4.5 mm, what is the concentration after 2.5 hours? 4.0 3.2e2 XmM

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