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I have to find the chemical formula and calculate the theoretical and percent yields.

I'm having trouble writing the chemical formula...So far i have

CuBr + HNO3 ----> CuNO3 + Br2 + H2

(I know its not balanced yet but i want to know if its right before i balance it)

and

CuNO3 + HNO3 ----> CuO + N2

(This also isnt balanced)

Do i have to combine these formulas to find a formula that models the reaction? If so, how do I do that?