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Sagot :
3.69 minutes will be needed to plate the chromium metal in the solution.
The charge transfer amount may be provided by:
q = It
where I is the current, t is the time, and q is the charge transfer
Q can be calculated by:
Moles of Cr = 0.0423 mole; As, moles = 2.19/51.9
Also, there is transfer of 3 electrons, thus, charge transfer will be faraday constant multiplied by 3
Charge transfer = 0.0423 *3* 96500 C
Charge transfer = 12245.85 C
As, q = it
12245.85 = 55.2 * Time
Time = 221.845 sec = 3.69 min
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