What is the equivalent weight of HNO3 in the given reaction ?4Zn + 10HNO3 →  4ZnNO32 + NH4NO3 + 3H2O

(3)HNO3→NH4+N5+ + 8e- →  N3-n-factor as reductant=89 moles of HNO3 is acting as acid, basicity is 1. As an acid, equivalent weight = MTotal equivalent weight = M (as acid) +M8( as Reducing agent)=9M8=9×638