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Suppose you are reacting copper with nitric acid through the reaction below in a sealed vessel

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Suppose you are reacting copper with nitric acid through the reaction below in a sealed vessel. You mix certain amounts of copper and HNO3 and find that there is no solid remaining after the reaction is complete. What was the limiting reactant? 4 HNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 NO2 (g) + 2 H2O (l)
 A. HNO3 
B. Cu 
C. Cu(NO3)2
 D. NO2 
E. H2O
 F. Impossible to tell from the information given.