The reactions involved between the components in this mixture are:

Nitric oxide (NO2) reacts with water to form nitric acid (HNO3):
3 NO2 + H2O -> 2 HNO3 + NO

Copper(II) nitrate (Cu(NO3)2) can react with copper(II) oxide (CuO) to form copper(II) nitrate again:
Cu(NO3)2 + CuO -> Cu(NO3)2 + Cu

Copper(II) nitrate can also react with copper phosphate (Cu3(PO4)2) to form copper(II) phosphate and copper(II) nitrate:
3 Cu(NO3)2 + Cu3(PO4)2 -> 6 Cu(NO3)2 + 2 Cu3(PO4)2

Overall, this mixture can lead to various reactions between the components present, resulting in different products depending on the specific conditions of the reaction.