12. Solving a chemistry problem
4. Coulometric titration of Cr3 in a sulfuric acid solution with electrically generated MnO4- ions at a current strength of 20.0 mA was completed in 250 s. Calculate the mass of Cr3 in solution.
1) 0.9 mg 2) 0.18 mg 3) 0.27 mg 4) 0.36 mg
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