A first order gas phase reaction :
A2B2 → 2A(g) + 2B(g)
at the temperature 400°C has the rate constant k = 2.0 x 10-4 sec-1. What percentage of A2B2 is decomposed on heating for 900 seconds ? [Antilog 0.0781 = 1.1971
=> 100 = 1.197[100 - x]
=> 1.119.7 - 1.197x
=> 1.197x = 19.7
.. . x = 19.7/1.197
= 16.45 %
