6. Determine the percentage of chromium in salt according to the following data: from a sample of salt in 1.01 g, chromium is oxidized to Cr2O72-, then 50.00 cm3 of 0.0300 N was added. Mohr's salt solution, the excess of which is titrated 5.50 cm3 0.3100 N. KMnO4 solution.

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