please help me. (A) Balance the copper reactions: (i ) Cu(s) + HNO 3 (aq) -> Cu(

Question

please help me. (A) Balance the copper reactions:       (i ) Cu(s) +   HNO3(aq)   -> Cu(NO3)2 (aq) + NO2(g) + H2O (l) (B) In reaction (i), suppose that you add 12.8 mL of 6 Mnitric acid to a spheref copper metal that weighs 1.06 grams. Whicheactant is thelimithing reagent? please help me. (A) Balance the copper reactions:       (i ) Cu(s) +   HNO3(aq)   -> Cu(NO3)2 (aq) + NO2(g) + H2O (l) (B) In reaction (i), suppose that you add 12.8 mL of 6 Mnitric acid to a spheref copper metal that weighs 1.06 grams. Whicheactant is thelimithing reagent?

Explanation / Answer

             Cu(s) +  4 HNO3(aq)  -> Cu(NO3)2 (aq) + 2NO2(g) + 2 H2O (l) Moles of nitric acid = Molarity * volume                               =6 m * 0.0128 L                               =0.0768 moles Moles of copper = Mass / atomic mass                            =1.06 g / 63.54 g/mol                            =0.0166 In the equation, 1 mole of copper can react with 4 moles ofnitric acid. So 0.0166 moles can react with   0.0664 moles ofnitric acid. As nitric acid is in excess, it means copper is the limitingreagent.

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