Em tham khảo nha :
\(\begin{array}{l}
4)\\
Zn + 4HN{O_3} \to Zn{(N{O_3})_2} + 2N{O_2} + 2{H_2}O\\
{n_{N{O_2}}} = \dfrac{{4,48}}{{22,4}} = 0,2mol\\
\Rightarrow {n_{Zn}} = \dfrac{{{n_{N{O_2}}}}}{2} = 0,1mol\\
{m_{Zn}} = 0,1 \times 65 = 65g\\
5)\\
Fe + 6HN{O_3} \to Fe{(N{O_3})_3} + 3N{O_2} + 3{H_2}O\\
{n_{N{O_2}}} = \dfrac{{6,72}}{{22,4}} = 0,3mol\\
\Rightarrow {n_{Fe}} = \dfrac{{{n_{N{O_2}}}}}{3} = 0,1mol\\
{m_{Fe}} = 0,1 \times 56 = 5,6g\\
6)\\
Fe + 6HN{O_3} \to Fe{(N{O_3})_3} + 3N{O_2} + 3{H_2}O\\
{n_{Fe}} = \dfrac{{5,6}}{{56}} = 0,1mol\\
\Rightarrow {n_{N{O_2}}} = 3{n_{Fe}} = 0,3mol\\
{V_{N{O_2}}} = 0,3 \times 22,4 = 6,72l
\end{array}\)
