At 500 ∘C, cyclopropane (C3H6) rearranges to propene (CH3−CH=CH2). The reaction is first order, and the rate constant is 6.7×10−4s−1. If the initial concentration of C3H6 is 5.00×10−2 M. What is the molarity of C3H6 after 30 min?     How many minutes does it take for the C3H6 concentration to drop to 1.20×10−2 M ?       How many minutes does it take for 25% of the C3H6 to react?

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