If Ag+ is converted to Ag, it has gained electrons. Ag+ indicates that silver has lost one electron, so when it is converted back to Ag, it means that electron has been gained back.
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1 mole Ag = 6.022 x 1023 atoms Ag
4.4910 x 1023 atoms Ag x 1 mole Ag/6.022 x 1023 atoms Ag =
0.7468 mole Ag