Question

For the decomposition of azo isopropanol to hexane and nitrogen at 543K, the following data are obtained.

t(sec)	p (mm of Hr)
0	35.0
360	54.0
720	63.0

Calculate the rate constant for the reaction.

Answer 1

The reaction is

Total pressure – p₀ – x + x + x

p_t = p₀ + x

or x = p_t – p₀

a ∝ p₀

∴ (a – x) ∝ p₀ – (p_t – p₀)

= 2p₀ – p_t

For the first order reaction