The half life for the decomposition of gaseous compound A is 240 s when the gaseous pressure was 500 Torr initially. When the pressure was 250 Torr, the half life was found to be 4 . 0 min . The order

Question

The half life for the decomposition of gaseous compound A is 240 s when the gaseous pressure was 500 Torr initially. When the pressure was 250 Torr, the half life was found to be 4 . 0 min . The order of the reaction is _____ (Nearest integer)

TestHub · Accepted Answer

t 1 2 500 torr = 240 sec = 4 min t 1 2 250 torr = 4 min . t 1 2 ∝ a 1 - n t 1 2 1 t 1 2 2 = a 1 a 2 1 - n 1 = 2 0 = 250 500 1 - n n = 1 As t 1 2 is independent of initial pressure. Hence, order is 1 st order.

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