kinetic energy

The atomic mass number of a single nitrogen atom is 14, and the separation between the two atoms in a nitrogen molecule (N2) is 1.098 × 10-10m. The rotational kinetic energy is given by erot = (1/2I)L2, where I is the rotational inertia about the particular axis and the angular momentum is quantized in the form L2 = l(l + 1) h2, where l = 0, 1, 2,… Find
(a) the rotational inertia of the nitrogen molecule about a perpendicular bisector of the molecular axis,
(b) the energy required for excitation from the non-rotating l = 0 state to the first excited rotational state,
(c) the excitation temperature for this excitation.