nH2=0,84(mol)
PTHH: Fe + 2 HCl -> FeCl2 + H2
0,84__________________0,84(mol)
=>mFe=0,84.56=47,04(g)
=> mCaCO3=48,8-47,04=1,76(g)
b) %mCaCO3=(1,76/48,8).100=3,607%
=>%mFe= 96,393%
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
\(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\uparrow\)
Ta có: \(n_{Fe}=n_{H_2}=\dfrac{18,816}{22,4}=0,84\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,84\cdot56=47,04\left(g\right)\) \(\Rightarrow m_{CaCO_3}=1,76\left(g\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CaCO_3}=\dfrac{1,76}{48,8}\cdot100\%\approx3,61\%\\\%m_{Fe}=96,39\%\end{matrix}\right.\)