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Mass of AgBr= 0.450g/(187.77g/mol) = 0.00240 mol

Moles of Na2S2O3= 0.00240/2 = 0.00120

V= 0.00120/0.0200 M = 0.0600L

Convert L to mL

Answer is 60.0 mL

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Q: How many milliliters of 0.0200M Na2S2O3 solutions are needed to dissolve 0.450g of AgBr?
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