Bob K. answered 10/12/15
Experienced math, chemistry, physics tutor
First determine a balanced equation for the reaction (clue: H2 is produced)
From balanced equation determine theoretical gm Cu(NO3)2 produced using unit cancellation:
Theoretical gm Cu(NO3)2 = (gm Cu / gm/mol Cu) x (mol Cu(NO3)2 / mol Cu) x gm/mol Cu(NO3)2
pct yield = 100 x actual gm Cu(NO3)2 / theoretical Cu(NO3)2
Im having trouble writing the balanced equation, I havent had too much practice with that
Mirsha - Start by putting the known reactants and products on opposite sides of the equation, then start matching individual elements. You already have one Cu on each side. You have two nitrate ions on one side so you will need two on the other side, in the form of nitric acid. The only element then not accounted for is the H in nitric acid. That's where hydrogen gas (H2) is needed to balance that. Check when done to make sure each element balances.
If you would like more help schedule a session with me. I can go through it (or similar problems) step by step with you.