`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`)

Options

A. `9.0 xx 10^(3)g`
B. `8.1 xx 10^(4)g`
C. `2.4 xx 10^(5)g`
D. `1.3 xx 10^(4)`

Answer

B

Explanation

Total current `=4.0 xx 10^(4) xx 6 xx 60 xx 60C`
96500C liberates 9g of Al (1g. eq)
`(4 xx 10^(4) xx 6 xx 60 xx 60)C` liberates `8.1 xx 10^(4)g` of Al