a) \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
b) \(m_{O_2}=61,25-42,05=19,2\left(g\right)\Rightarrow n_{O_2}=\dfrac{19,2}{32}=0,6\left(mol\right)\)
PTHH: \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
0,4<------------0,6
=> \(\%m_{KClO_3\left(bị.nhiệt.phân\right)}=\dfrac{0,4.122,5}{61,25}.100\%=80\%\)