[SOLVED] Translational Kinetic Energy 1. The problem statement, all variables and given/known data (Q) Find the average translational kinetic energy of nitrogen molecules at 1600K. 2. Relevant equations Translational KE per degree of freedom = 1/2kT. 3. The attempt at a solution Since Nitrogen molecules are diatomic, it has 5 degrees of freedom so KE = 5/2kT. The problem is that this yields the wrong answer and the answer at the back of the book uses the formula 3/2kT. Can someone please explain to me why this is so? Thank-you very much in advance.