CHÚC BẠN HỌC TỐT
a) Theo đề bài, ta có: \(\left\{{}\begin{matrix}n_{KClO3}=\dfrac{15}{122,5}=\dfrac{6}{49}\left(mol\right)\\n_{O2\left(TT\right)}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\end{matrix}\right.\)
PTHH: \(2KClO3\underrightarrow{o}2KCl+3O_2\)
pư..............\(\dfrac{6}{49}\)............\(\dfrac{6}{49}\).........\(\dfrac{9}{49}\) (mol)
\(\Rightarrow m_{O2\left(LT\right)}=32.\dfrac{9}{49}=\dfrac{288}{49}\left(g\right)\)
\(\Rightarrow H=\dfrac{m_{O2\left(TT\right)}}{m_{O2\left(LT\right)}}=\dfrac{0,15.32}{\dfrac{288}{49}}.100\%\approx81,67\%\)
b) \(\Rightarrow\left\{{}\begin{matrix}\%K=\dfrac{39}{39+35,5}.100\%\approx52,35\%\\\%Cl=\dfrac{35,5}{39+35,5}.100\%\approx47,65\%\end{matrix}\right.\)
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