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)

Answer 1

($t_{\frac{1}{2}}$)A=240 s when P=500 torr
($t_{\frac{1}{2}}$)A=4 minutes=4×60=240 seconds when P=500 torr
If means half-life is independent of the concentration of reactant present.
∴ Order of reaction = 1