How many minutes will it take to plate out 2.19 g of chromium metal from a solution of cr3+cr3+ using a current of 55.2 amps in an electrolyte cell?

Answer : The time it take to plate out will be, 3.69 minutes.

Explanation :

First we have to calculate the moles of Cr.

Molar mass of Cr = 51.9 g/mol

The cathode half-reaction is,

From this we conclude that,

The number of electrons (n)  in the reaction are 3.

The quantity of charge required for the reduction of 1 mole of =

The quantity of charge required for the reduction of 0.0423 mole of =

Now we have to calculate the time taken.

We know that,

Thus, the time it take to plate out will be, 3.69 minutes.

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.