1. The problem statement, all variables and given/known data The question asks whether the kinetic energy of a particle is increased if mass is increased. Particle fulfills criteria of an ideal gas. 2. Relevant equations KE = 3/2RT = 1/2 mv^2 3. The attempt at a solution My confusion is how can one derivation be dependent on mass and the other does not. Which do we use under which circumstances? Does KE depend on mass or does it not?