What is the kinetic energy, in J, of (a) an Ar atom moving at a speed of 650 mgt;s, (b) a mole of Ar atoms moving at 650 mgt;s? Posted on July 1, 2021 | by wp What is the kinetic energy, in J, of (a) an Ar atom moving at a speed of 650 m>s, (b) a mole of Ar atoms moving at 650 m>s? (Hint: 1 amu = 1.66 * 10-27 kg.)