i need help with this question(please explain)?

Question

What is the average kinetic energy of CH4 and N2 molecules at:

299 K-

523 K-

Answer 1

Please refer to my answer to a similar problem at follow link:
http://answers.yahoo.com/question/index;_ylt=ApkTAFxcz9UmjynU0_3C4SLty6IX;_ylv=3?qid=20071014200147AAKTsDO&show=7#profile-info-AA11267958

Here N2 is different from Ar, which is monatomic gas and thus 3 degrees of translational freedom. N2 is a linear molecule, and thus has 3 degrees of translational freedom, and 2 degrees of rotational freedom. The kinetic energy of N2 is (5/2)nRT, while for CH4 is (6/2)nRT.
Now you do the math.