a) mKMnO4=69,52.90%=62,568 (g)
nKMnO4=62,568 : 158=0,396 (mol)
PTHH: 2KMnO4 -t°-> K2MnO4+MnO2+O2
0,396 0,198 (mol)
V O2=0,198.22,4=4,4352 (lít)
b) PTHH: 2KClO3 -t°-> 2KCl+3O2
0,198 0,297 (mol)
mKClO3=0,297.122,5=36,3825 (g)
mKClO3 (chứa tạp chất)=36,3825.105%=38,201625 (g)