Aluminium oxide may be electrolysed at `100^(@)C` to furnish aluminium metal (atomic mass=27 amu). The cathodic reaction is : `Al^(3+)+3e^(-) to Al` T

Question

Aluminium oxide may be electrolysed at `100^(@)C` to furnish aluminium metal (atomic mass=27 amu). The cathodic reaction is : `Al^(3+)+3e^(-) to Al` T

Aluminium oxide may be electrolysed at `100^(@)C` to furnish aluminium metal (atomic mass=27 amu). The cathodic reaction is :
`Al^(3+)+3e^(-) to Al`
To prepare 5.12 kg of aluminium metal by this reaction would require :
A. `549xx10^(7)" C"` of electricity
B. `1.83xx10^(7)" C"` of electricity
C. `5.49xx10^(7)" C "` of electricity
D. `5.49xx10^(10)" C "` of electricity

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - C
(c ) `Al^(3+)+underset(3xxF)3e^(-) to underset(27g)Al`
To deposit 27 g of Al metal, electricity needed `=3xxF`
To deposit 5120 g of Al metal,
electricity needed `=(3F)/((27 g))xx(5120 g)`
`=568.89 F=5.49xx10^(7)" C "`

4 views Answered 2023-02-05 15:29