The cycle of copper reactions starts with solid copper metal and ends with solid copper metal. Suppose you start with 0.492 g of Cu. After performing all the reactions, you have 0.459 g of Cu. What percentage of the copper did you recover?

Answerbonded to an amino group(nh2);

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According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.