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12 mL of Na 2 S 2 O 3 (0.05 N) solution reacts with iodine liberated by Cu 2+ present in 20 mL of brass

12 mL of Na₂S₂O₃ (0.05 N) solution reacts with iodine liberated by Cu²⁺ present in 20 mL of brass solution. What is the weight of the copper (in grams) in a liter of the solution containing 2.4 g of brass?

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