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The reaction C2H5CN(g)-----> CH2CHCN(g) +H2(g) is first order. In an experiment, the rate constant is determined to be 0.148 s-1 at 726°C.

(a) Calculate the half-life of the reaction at 726°C based on this experiment.

__________s

(b) If the initial partial pressure of C2H5CN in a container at 726°C is 2.64 atm, how long will it take to fall to 0.330 atm?

____________s

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