cyclopropane, C3H6, is converted to its isomer propylene, CH2=CHCH3, when heated. the rate law is first order in cyclopropane, and the rate constant is 6.0x10-4/sec at 500C. if the initial concentration of cyclopropane is 0.0226 mol/l, what is the concentration of cyclopropane after 899sec? what is the half-life of this reaction?