Answer to Question #152985 in Physical Chemistry for Bakr

Question

Q11:- At 400 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 28.9 kPa, the half-life was 178 s. Determine the order of the reaction.

Answer 1

Let's test n=0:

$k_1=(p_0)_1/(2*t_{1/2})=55500/(2*340)=81.6$

$k_2=(p_0)_2/(2*t_{1/2})=28900/(2*178)=81.1$

Constants are almost equal, so we have 0-order reaction.