deduc concentratiile molare :
[A}=0,2X1000./200 mol/l= 1 mol/l
[B]= 0,3X1000/200mol/l=1,5mol/l
deduc u.m. pentru k, stiind ca v se exprima in mol/l s
daca k=v/[A]²[B]= mol/l s : mol³/l³=l²/mol² s--> ordin de reactie 3
v= k[A]²[B]= 3X10⁻²X1²X1,5=> 4,5X10⁻²mol/l s