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Use the following information to answer the next question. Before fleeing Denmark in 1943, Niels Bohr prevented two Nobel prize gold medals from being seized by German authorities. The gold was reacted with aqua regia (a combination of concentrated nitric acid and hydrochloric acid). The unbalanced equation for the reaction that Bohr used is Au(s) + H(aq) + NO3 (aq) + Cl(aq) Aucla (aq) + NO2(g) + H2O() After the Second World War, the gold was recovered, and then the medals were recast. 7. a. Balance the equation above using oxidation-reduction methods. Identify the oxidizing and reducing agents and the number of electrons lost or gained by each. (5 marks) b. If the initial combined mass of the gold in the medals was 167 g and the total volume of the aqueous solution was 3.50 L, then what was the final concentration of Aucla (ag) after the medals were completely reacted? (2 marks) C. The reduction potential for the Aucla (ag) half-reaction is 1.00 V. Suggest a substance that could be used to convert the AuCl4 (aq) back into Au(s). Justify your choice. (2 marks)