O sa iau N=289,59x10²² molecule O2 ;N,A= 6,023X10²³molec/mol
n(niu)= N/N,A= 4,8 mol O2
2mol......................3mol
2KClO3---> 2KCl+ 3O2
x...........................4,8mol
x=3,2mol KCLO3
m=nxM
m= 3,2mol(39gK+35,5gCl+3x16gO)/mol= ....calculeaza !!!!--> varianta c!