mHCl = \(\dfrac{73.20}{100}\)= 14,6 g
=>nHCl = \(\dfrac{14,6}{36,5}\)= 0,4 mol
a)
Zn + 2HCl -> ZnCl2 + H2\(\uparrow\)
0,2<-0,4 mol
b) mZn = 0,2. 65 = 13 g
a)PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
b)\(m_{HCl}=\dfrac{20.73}{100}=14,6\left(g\right)\)
\(\Rightarrow n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
Theo PTHH: \(n_{Zn}=\dfrac{1}{2}n_{HCl}=\dfrac{1}{2}.0,4=0,2\left(mol\right)\)
\(\Rightarrow m_{Zn}=0,2.65=13\left(g\right)\)