\(n_{NaCl}=a\left(mol\right)\)
\(n_{KCl}=b\left(mol\right)\)
\(m_{hh}=58.5a+74.5b=30.325\left(g\right)\left(1\right)\)
\(n_{AgCl}=\dfrac{64.575}{143.5}=0.45\left(mol\right)\)
\(NaCl+AgNO_3\rightarrow NaNO_3+AgCl\)
\(KCl+AgNO_3\rightarrow KNO_3+AgCl\)
\(\Rightarrow a+b=0.45\left(2\right)\)
\(\left(1\right),\left(2\right):a=0.2,b=0.25\)
\(m_{NaCl}=0.2\cdot58.5=11.7\left(g\right)\)
\(m_{KCl}=0.25\cdot74.5=18.625\left(g\right)\)
Gọi x, y lần lượt là số mol NaCl, KCl
\(NaCl+AgNO_3\rightarrow AgCl+NaNO_3\)
\(KCl+AgNO_3\rightarrow AgCl+KNO_3\)
\(n_{AgCl}=\dfrac{64,575}{143,5}=0,45\left(mol\right)\)
Ta có hệ \(\left\{{}\begin{matrix}58,5x+74,5y=30,325\\x+y=0,45\end{matrix}\right.\)
=> x=0,2 ; y=0,25
=> \(m_{NaCl}=11,7\left(g\right);m_{KCl}=18,625\left(g\right)\)
\(\left\{{}\begin{matrix}n_{NaCl}=a\left(mol\right)\\n_{KCl}=b\left(mol\right)\end{matrix}\right.\left(a,b>0\right)\)
PTHH:
\(NaCl+AgNO_3\rightarrow NaNO_3+AgCl\\ ...a.....a.........a.....a\left(mol\right)\\ KCl+AgNO_3\rightarrow KNO_3+AgCl\\ b.........b........b..............b\left(mol\right)\\ \Rightarrow\left\{{}\begin{matrix}58,5a+74,5b=30,325\\143,5a+143,5b=64,575\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,2\\b=0,25\end{matrix}\right.\\ \left\{{}\begin{matrix}m_{NaCl}=58,5.0,2=11,7\left(g\right)\\m_{KCl}=74,5.0,25=18,625\left(g\right)\end{matrix}\right.\)
