what reactants are added together to get copper nitrate!
It turns out, it is a complicated reaction to get compounds of copper, copper is a very unreactive element.
Using commerical reactants, this way.
Cu (refined ore)+ 2N2O4>>Cu(NO3)2 + 2NO(g)
N2O4 (dinitrogen tetraoxide) occurs naturally in equilibrium with NO2, a commercial gas. N2O4 is used in rocket fuels (with hydrazine). N2O4 is widely used. Nitrogen dioxide is made by the catalytic oxidation of ammonia: steam is used to reduce the combustion temperature. Most of the water is condensed out, and the gases are further cooled; the nitric oxide that was produced is oxidized to nitrogen dioxide, and the remainder of the water is removed as nitric acid. The gas is essentially pure nitrogen tetroxide, which is condensed in a brine-cooled liquefier. (from wiki)