Answer to Question #139132 in Physical Chemistry for Sally

Question

At 400K, 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 28.9 kPa, the
half-life was 178 s. Determine the order of the reaction.

Answer 1

Change of pressure: 55.5 / 28.9 =1.92 approx. 2 times

Change of rate: 340 / 178 = 1.91 approx. 2 times

The half-life is proportional to the pressure, so this is a 0-order reaction