what is the velocity of a cholrine molecule at 35 degrees C?

Answer 1

Which one?
v(rms) = √(3(8.314472 J/K·mol)(273 + 35)(1 mol/70.9 g)(10^3 g/kg)

v(rms) = 329.17 m/s

v(most probable) = 301.53 m/s
v(mean speed) = 303.17 m/s

A very few will have velocities near 0, and a very, very few will have escape velocity.