\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right);n_{HCl}=\dfrac{7.3}{36.5}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
Vì 0,1/1=0,2/2
nên phản ứng này hết
=>\(n_{H_2}=\dfrac{1}{2}\cdot n_{HCl}=0.1\left(mol\right)\)
\(m=0.1\cdot2=0.2\left(g\right)\)
\(BTKL:m_{Fe}+m_{HCl}=m_{FeCl_2}+m_{H_2}\\ \Leftrightarrow5,6+7,3=12,7+m_{H_2}\\ \Leftrightarrow m_{H_2}=0,2g\)