Chemistry

Problem

For the reaction

2\,\mathrm{HI}(g)\;\rightleftharpoons\;\mathrm{H_2}(g)+\mathrm{I_2}(g)

400\,\text{K}

, the equilibrium constant is

K_c = 0.015

. After the system at equilibrium is subjected to a sudden stress, the following concentration data (in mol\,L

^{-1}

) are recorded.

Time (min)	[HI]	[H $_2$ ]	[I $_2$ ]
0	1.20	0.10	0.10
1	1.10	0.12	0.12
2	1.05	0.13	0.13
3	1.02	0.135	0.135
4	1.02	0.135	0.135

At which recorded time is the mixture closest to equilibrium? a) 4 min b) 0 min c) 1 min d) 2 min