\(n_{CuFeS_2}=\dfrac{15}{64+56+32\cdot2}=\dfrac{15}{184}\left(mol\right)\)
PTPƯ: \(3CuFeS_2+32HNO_3\rightarrow3Cu\left(NO_3\right)_2+3Fe\left(NO_3\right)_3+6H_2SO_4+17NO\uparrow+10H_2O\)
Từ ptpư \(\Rightarrow n_{NO}=\dfrac{85}{184}\)
Thể tích: \(V_{NO}=\dfrac{85}{184}\times22,4=\dfrac{238}{23}\left(l\right)\)