Problem 5 You are given the following data for the decomposi

Problem 5 You are given the following data for the decomposition of acetaldehyde (A). Al. M 0.00972 0.00456 Half-Life (s) 328 685 Determine the order of the reaction AND the rate constant. Assume: A Products

Solution

half life increased as [Ao] decreases , hence its 2nd order , we can check for k value

for 2nd order k = ( 1/[Ao] x t1/2)

= 1 / ( 0.00972 x 328) = 0.31366 s-1

k = 1 / ( 0.00456 x 685) = 0.32 s-1

hence we nearly got same values of k

hence order is 2 , rate constant k = ( 0.31366 + 0.32) / 2 = 0.317