For the exercise in this topic, base your answers on the potentials listed in Table 6M.1 or Appendix 2B, with the exception of the reduction and oxidation of water at pH = 7:Suppose that 2.69 g of a silver salt (AgX) is dissolved in 550 mL of water. With a current of 3.5 A, 395.0 s was needed to plate out all the silver.

(a) What is the mass percentage of silver in the salt?

(b) What is the formula of the salt?

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2 H₂O(1) + 2 e → H₂(g) + 2 OH¯ (aq), E = O₂(g) + 4H+ (aq) + 4e¯ 2 H₂O (1), E = -0.42 V at pH = 7 +0.82 V at pH = 7