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90. Solving a chemistry problem

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What is the duration of the electrolytic deposition of a tin layer 15 µm thick: a) from an electrolyte containing Na2SnO3 at a current density of 3.0 A/dm2 and W=60%; b) from sulfate electrolytes SnSO4 at a current density of 4.0 A/dm2 and W=90%.
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