a, \(Ag+2HNO_{3\left(đ\right)}\underrightarrow{t^o}AgNO_3+NO_2+H_2O\)
\(Cu+4HNO_{3\left(đ\right)}\underrightarrow{t^o}Cu\left(NO_3\right)_2+2NO_2+2H_2O\)
\(AgNO_3+HCl\rightarrow HNO_3+AgCl_{\downarrow}\)
b, Chất rắn không tan là Au.
⇒ mAu = 0,079 (g) \(\Rightarrow\%m_{Au}=\dfrac{0,079}{6}.100\%\approx1,32\%\)
Ta có: \(n_{AgCl}=\dfrac{7,175}{143,5}=0,05\left(mol\right)\)
Theo PT: \(n_{Ag}=n_{AgNO_3}=n_{AgCl}=0,05\left(mol\right)\)
\(\Rightarrow\%m_{Ag}=\dfrac{0,05.108}{6}.100\%\approx90\%\)
\(\%m_{Cu}\approx8,68\%\)