2х/3                    x

2KClO3=2KCl+3O2

2                           3

    2y                                          y

2KMnO4=K2MnO4+MnO2+O2

2                                                1

n(O2)=49,28:22,4=2,2; m(KClO3)=2x/3*122,5; m(KMnO4)=2y*158;

                          x+y=2,2  (1)

                       245x/3+316y=273,4 (2)

                             y=0,4; x=1,8;

        m(KClO3)=147; m(KMnO4)=126,4.