The percentage of Ag in a lead sample was determined as follows. A 1.050 g sample was dissolved in nitric acid to produce Pb2 (aq) and Ag (aq). The solution was then diluted to 500.0 mL with water, a Ag electrode was immersed in it, and the potential difference between this electrode and a SHE was found to be 0.503 V. What was the mass percentage of silver in the lead metal? Use the table of reduction potentials.