How does the average kinetic energies per molecule compare...?

Question

in a mixture of hydrogen and nitrogen gases at the same temperature?

Answer 1

Same.

Answer 2

Ek = mv^2

which reads, kinetic energy = mass * velocity squared.

at the same temperature, all molecules have the same average kinetic energy, Ek

they have different speeds however, since nitrogen is more massive than hydrogen. If we know the kinetic energy, Ek, and the mass of of a molecule (molar mass divided by avagadro's number), we can find the velocity of each molecule.

(thumbsup/best answer if this helps :)