Match the type of reaction to the equation

What is the overall order of reaction for rate = k[no]2[o2]

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)

Particles vibrate in a rigid structure and do not move relative to their neighbors.