7. From a sample of 0.700 g of chloride, 250 cm3 of solution was prepared. To 25.00 cm3 of this solution was added 25.00 cm3 of silver nitrate with T = 0.01700 g/cm3. 20.00 cm3 0.05 N was used for back titration. ammonium thiocyanate solution. How much chlorine (in %) did the sample contain?

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