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Question

In the following sequence of reactions:
CaOCl2+H2OCa(OH)2+Cl2
2KI+Cl22KCl+I2
I2+2Na2S2O3Na2S4O6+2NaI
Calculate moles of Na2S2O3 required for complete reduction of I2 obtained from 127 g CaOCl2 sample (50% purity).

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