Exercise 1
These two charts show the number of accessible translational states for Nitrogen molecules increases with both volume and temperature. For volume this correlation is linear. For temperature this correlation increases at a rate proportional to T^1.5. This makes physical sense because as the volume and temperature increase, it is easier for molecules to access higher translational states.
Exercise 2
The number of occupied rotational states increases with increased atomic mass and bond length (as seen by the increasing rotational partition functions given abvove). As the moment of inertia increases (i.e, as the bond length or mass increases), the rotational energy level spacings decrease making it easier to occupy higher energy levels.