HPHP48-E-@,*A 2 21 Dtermination 2 21 de l'ordre 2 2 1d'une raction 2 2 *UBOrdre 0 =k courbe:[A]=[A]401-kt [A]=f(t) =[A]401/2k *UBOrdre 1 =k*[A] [A]=[A]40*1exp(-kt) ln[A]=ln[A]401-kt =ln(2)/k *UBOrdre 2 **UAB+C =k[A]32 1/[A]-1/[A]401=kt 1/[A]=kt+1/[A]40 =1/k[A]40 **UA+BC+D =k[A][B] ***[A]401[B]40 a=[A]40 b=[B]40 =U 1 UlnU2b-aU k(b-a) b ***[A]40=1[B]40 =1/ak +1 M