PTHH: \(2KNO_3\underrightarrow{t^o}2KNO_2+O_2\uparrow\)
\(2Zn\left(NO_3\right)_2\underrightarrow{t^o}2ZnO+4NO_2\uparrow+O_2\uparrow\)
\(\left\{{}\begin{matrix}KNO_3:a\left(mol\right)\\Zn\left(NO_3\right)_2:b\left(mol\right)\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}101a+189b=34,05\\\dfrac{a}{2}+2b+\dfrac{b}{2}=0,325\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}a=0,15\\b=0,1\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}\%KNO_3=\dfrac{0,15.101}{34,05}.100\%=44,5\%\\\%Zn\left(NO_3\right)_2=55,5\%\end{matrix}\right.\)