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)

Step-by-step solution

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.