At 345 K , the half life for the decomposition of a sample of a gaseous compound initially at 55 . 5 kPa was 340 s . When the pressure was 27 . 8 kPa , the half life was found to be 170 s . The order of the reaction is - [integer answer]

Question

At 345 K , the half life for the decomposition of a sample of a gaseous compound initially at 55 . 5 kPa was 340 s . When the pressure was 27 . 8 kPa , the half life was found to be 170 s . The order of the reaction is - [integer answer],

MARKS App · Accepted Answer

t 1 / 2 1 t 1 / 2 2 = P 1 P 2 1 - n ⇒ 340 170 = 55 . 5 27 . 8 1 - n 2 1 = 2 1 - n 1 = 1 - n ⇒ n = 0 For zero order reaction half life is directly proportional to the initial concentration.

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