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Al(2)O(3) is reduced by electrolysis at ...

`Al_(2)O_(3)` is reduced by electrolysis at low potentials and high current. If `4.0 xx 10^(4)` amperes of currernt is passed through molten `Al_(2)O_(3)` for 6 hours, what mass of aluminium is produced? (Assume 100 % current efficiency, At. Mass of `Al = 27 u`)

A

`8.1xx10^(4) g`

B

`2.4xx10^(5) g`

C

`1.3xx10^(4) g`

D

`9.0xx10^(3) g`.

Text Solution

Verified by Experts

The correct Answer is:
A
(a) `Z=((9g" equiv"^(-1)))/((96500 amp -s" equiv"^(-1)))`
`W=Zxxlxxt`
`=((9g" equiv"^(-1)))/((96500 amp -s" equiv"^(-1)))xx(4xx10^(4) amp)xx(6xx60xx60s)`
`=8.1xx10^(4)g`
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