I did this, but not sure if it's right or not. My thinking was that the system wants to reverse the change. Reversing the change means restoring the previous value of H
2, so that stays the same.
In order to do this, the concentration of HI needs to increase and the concentration of I
2 needs to decrease for Kc to stay the same. I didn't think about it for long, so I'm probably not right. Now I think about it, if it did shift all the way to the right, then I
2 will have decreased by too much, so it will shift back a bit and form a compromise between too much H
2 and too little I
2. This compromise leads to [H
2] still being higher, [I
2] being lower and [HI] being the same. So, I literally have no idea on this question. Oh well, it's only two marks