Answe 17th question....

Dear Student,

Please go through the following link having a similar query:

https://www.meritnation.com/ask-answer/question/a-first-order-reaction-is-50-complete-in-36min-at-300k-the/chemistry/2612782


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Their is two half lifes given so you can calculate the rate constant for the two.and use the formula logk2/k1=Ea/2.303R(1/T1 -1/T2)
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