Answer:
The answer to your question is 6
Explanation:
Data
       Cu  +  2AgNO₃  ⇒ Â
To find the answer, count the number of each element in the reactants
Element         Quantity
Copper             1
Silver              2
Nitrogen            1
Oxygen             6
Then, in the products, there must be 6 oxygens so in the products there must be 6 oxygens so the reaction is balanced. Â Â Â Â Â Â Â