If 5.0 M HI is initially placed into a container, what will be the equilibrium [HI] Only need question 16 and plz show ur steps so I can learn.

)in the deacon process for the manufacture of chlorine, hcl and o2 react to form cl2 and h2o. sufficient air (21 mole% o2, 79% n2) is fed to provide 35% excess oxygen, and the fractional conversion of hcl is 85%. calculate the mole fractions of the product stream components.