Sodium thiosulfate (Na2S2O3), the major component in photographic fixer solution, reacts with silver bromide to dissolve it according to the following reaction:
(a) How many moles of Na2S2O3 would be required to react completely with 0.450 g of AgBr?
(b) How many mL of 0.02 M Na2S2O3 contain this number of moles?
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