Sodium thiosulfate, Na2S2O3, is a chemical used in traditional
photography. It reacts with silver bromide on film according to the
following (unbalanced) equation: AgBr (s) + Na2S2O3 (aq) →
Na3Ag(S2O3)2 (aq) + NaBr (aq)
a. How many moles of Na2S2O3 would be required to completely
react with 0.500 g AgBr?
b. How many milliliters of a 0.0245 M Na2S2O3 solution would
accomplish this?