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makkiz [27]
2 years ago
11

PLEASE HELP THIS IS AN EMERGENCY!!!!!

Chemistry
1 answer:
otez555 [7]2 years ago
6 0

Answer:

D

Explanation:

i think its D because 3p33d74s2

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Purification of copper can be achieved by electrorefining copper from an impure copper anode onto a pure copper cathode in an el
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Explanation:

Q=I\times t

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t= time in seconds = ?

The deposition of copper at cathode is represented by:

Cu^{2+}+2e^-\rightarrow Cu

96500\times 2=193000 Coloumb of electricity deposits 1 mole of copper

i.e. 63.5 g of copper is deposited by = 193000 Coloumb

Thus 19.0 kg or 19000 g of copper is deposited by = \frac{193000}{63.5}\times 19000=57748032 Coloumb

57748032=39.5\times t

t=1461975sec=406hours    (1hour=3600s)

Thus it will take 406 hours to plate 19.0 kg of copper onto the cathode if the current passed through the cell is held constant at 39.5 A

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A rigid container of gas has a pressure of 1.72 atm and temperature of 21 oC. If the temperature increases to 85 oC, what is the
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The reaction will continue in the forward direction until all the NO or all the NO₂ is used up.

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