3. A sample of a non-ferrous alloy with a mass m (g) was dissolved and, by electrolysis at a constant current strength I, for a time τ, copper was completely isolated on the cathode and lead on the anode in the form of PbO2. Determine the mass fraction w (%) of copper and lead in the alloy if the current efficiency η is 100%:
Option 3
m, g 1.811
I, A 0.220
τ, min 40.0

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