How many spoons can be electroplated by silver when 7a current is passed through electrolytic cell of agno3 for 3.5hrs 20mg layer is deposited on each spoon?
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Answer:
Charge passed through the electrolyte:
Q=ItQ=It
Q=7 \times 1.93 \times 3600Q=7×1.93×3600 C
Q=48636\ CQ=48636 C
Reduction process:
Ag^+ +e \rightarrow AgAg
+
+e→Ag
One mole of electron charge (96500\ C96500 C) will produce 108 g Ag
Moles of electron=\frac{48636}{96500}=0.504=
96500
48636
=0.504
Total silver deposited:
=0.504 \times 108=54.432 \ g=0.504×108=54.432 g Ag
coating on one spoon =0.01\ g=0.01 g Ag
number of spoons coated \times× coating on 1 spoon = {54.432}54.432
number of spoons coated =\frac{54.432}{0.01}
0.01
54.432
=5443=5443 spoons
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