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$Fe_xS_y+HNO_3 \rightarrow NO+NO_2+H_2SO_4+Fe(NO_3)_3+H_2O$

$Fe_xS_y \rightarrow xFe^{3+}+yS^{6+}+(3x+6y)e \ \ \ \ $ |x6

$4NO_3^- +10H^+ + 6e \rightarrow NO+3NO_2+5H_2O \ $|x3(x+2y)

$6Fe_xS_y+(30x+24y)H_NO_3 \rightarrow 6xFe(NO_3)_3+6yH_2SO_4+(3x+6y)NO+(9x+18y)NO_2+(15x+6y)H_2O$
 
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