81. Solving a chemistry problem
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81. Solving a chemistry problem
5. A weighing of 0.2485 g of the alloy was dissolved in acid and lead in the form of PbO2 was quantitatively isolated on the anode, spending 3 minutes 48 seconds at a current of 0.15 A. Current efficiency 90%. Calculate the mass fraction of lead (%) in the alloy.
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