What is average kinetic energy?

What is the average kinetic energy of a nitrogen molecule at STP?

a. What is the average kinetic energy of a nitrogen molecule at STP? b. What is the total translational kinetic energy of 5.00 mol of N2 molecules at 50°C? If you can just explain how to do it I can calculate the answer. Im just confused cus I know little about chem stuff.
Answer:

a. A nitrogen molecule has 5 degrees of freedom: 3 translational (for the 3 spatial dimensions it can move), 1 rotational, and 1 vibrational. For each degree of freedom, a molecule has kinetic energy: kRT/2 where k is the Boltzmann constant, R the ideal gas constant, and T is absolute temperature. The average kinetic energy of a nitrogen molecule would be: 5kRT/2 Standard temperature is 273 K. b. The translational kinetic energy of one nitrogen molecule would be: 3kRT/2 Multiply by 5 and by Avogadro's number for the absolute temperature given.

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