which ranks the gases in order of increasing average velocity?

Question

H2<O2<Cl2<Xe

Xe<Cl2<O2<H2

O2=Cl2=H2<Xe

Answer 1

kinetic energy = 1/2 mv²
where m is mass and v is velocity. At the same temperature all of the gases will have the same kinetic energy. Therefore, the higher the mass the ????? the velocity and the lower the mass the ????? the velocity.