\(n_{NO}=a, n_{NO_{2}}=b\)
\(C
u
+
4
H
N
O
_{3}
→
C
u
(
N
O
_{3}
)
_{2}
+
2
N
O
_{2}
↑
+
2
H
_{2}
O\)
\(3
C
u
+
8
H
N
O
_{3}
→
3
C
u
(
N
O
_{3}
)
_{2}
+
2
N
O
↑
+
4
H
_{2}
O\)
\(\Rightarrow 1,5a+0,5b=n_{Cu}=12,8:64=0,2(1)\)
\(M_{hh khí}=(30a+46b):(a+b)=38\)
\(\Rightarrow a=b(2)\)
\((1)(2)\Rightarrow a=b=0,1(mol)\)
\(V_{hh khí}=4,48l\)