Textbook problem 5J.5d

[Jenny Chau 1I]

On problem d, the chemical equilibrium looks as it does on the textbook:

Is d2 supposed to be shorthand for something?

[Marisa Gaitan 2D]

I believe it's a typo. In Lavelle's solution manual errors pdf on his website, the correct equation should have capital letter D in place of the lowercase d. I think it just stands for an unknown halide.

[Mary Shih 3J]

this may be a typo. either way, the important thing to notice is that it is a gas that will be impacted if pressure changes

[Jaclyn Dang 3B]

Its a typo, theres a solutions manual pdf somewhere that corrects it.

[Jenny Chau 1I]

I ended up assuming that the D was supposed to represent deuterium which is just an isotope of hydrogen. So in order to make the equation balanced, I put a 3 in front of the d2. And because the moles are equal on both sides, this would mean there's no change in the equilibrium distribution. Can anyone confirm if this is the correct way of thinking about this?

[Matlynn Giles 2E]

I had this same issue. It turned out to be a typo.