$($ii$)$ The reaction:

H$2+$ I$2->2$HI

Is believed to proceed via the following mechanism

I$2$

k$1$

$->$ I $+$ I

I $+$ I

k$1$

$->$ I$2$

H$2+$ I $+$ I

k$2$

$->2$HI

Apply the steady state approximation to the intermediate I and obtain an

expression for the rate law for the formation of products in terms of $[$H$2],[$I$2]$ k$1,$

k$-1,$ and k$2$