Which substance can be decomposed by chemical means?
1 answer:
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Explanation:
It is given that mass is 11 kg. Convert mass into grams as follows.
= 11000 g (as 1 kg = 1000 g)
Now, calculate the number of moles as follows.
No. of moles =
=
= 211.54 mol
For , 3 moles of electrons are required
Hence,
= 634.62 mol
As 1 mol of electrons contain 96500 C of charge. Therefore, charge carried by 634.62 mol of electrons will be calculated as follows.
Q =
= of charge
We know that relation between charge, current and time is as follows.
Q =
Current is given as 41.5 A and charge is calculated as . Therefore, calculate the time as follows.
Q =
t =
As there are 3600 seconds in one 1 hour. Therefore, converting into hours as follows.
= 4.09 hr
Thus, we can conclude that it takes 4.09 hours to plate 11.0 kg of chromium onto the cathode if the current passed through the cell is held constant at 41.5 A.