In the gas phase at 500.°C, cyclopropane reacts to form propene in a first-order reaction. The figure shows the natural logarithm of the concentration of cyclopropane (in mol/L) plotted versus time. A. Determine the initial concentration of cyclopropane in this experiment. B. At what time in seconds, will the concentration drop to 0.0235 M. C. What is the half-life in seconds?

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