`a.` In the following reactions, what weight of substance would be liberated if `1F` of electricity were passed through the cell `:`
`i. Cu^(2+)+2e^(-) rarr Cu` `ii. Al^(3+)+3e^(-) rarr Al`
`iii. 2Cl^(c-) rarr Cl_(2)+2e^(-)` `iv. Ag^(o+)+e^(-) rarr Ag`
`b.` In the series of cathodes `//` anodes given above, how many coulombs are needed to produce `1 g` of each of

Options

A. `Cu`
B. `Al`
C. `Cl_(2)`
D. `Ag`

Answer

`a. i. 31.75g" "ii. 9g" "iii. 35.5g" "iv. 108g `
`b.` `i. 3039C" "ii. 10722.2C" "iii. 2718.3C" "iv. 893.5C`

Explanation

`i. Cu^(2+)+2e^(-) rarr Cu`
`[{:(2e^(-),2F-=1 mol of Cu,,=,63.5g),(1F,(63.5)/(2)=31.75g,,,):}]`
`ii. Al^(3+)+3e^(-) rarr Al `
`[{:(3e^(-),3F-=1 mol of Al,,=,27g),(1F,(27)/(3)=9.0g,,,):}]`
`iii. 2Cl^(c-) rarr Cl_(2)+2e^(-)`
`[{:(2e^(-),2F-=1 mol of Cl_(2),,=,71.0g),(1F,(71.0)/(2)=35.5g,,,):}]`
`iv. Ag^(o+)+e^(-) rarr Ag`
`[1e^(-)=1F=1mol` of `Ag =108g]`
`b.` `i. Cuimplies((1)/(63.5))xx(96500xx2C)=3039.5C`
`ii. Alimplies((1)/(27))xx(96500xx3C)=10722.2C`
`iii. Cl_(2)implies((1)/(71))xx(96500xx2C)=2718.3C`
`iv. Agimplies((1)/(108))xx(96500xx1C)=893.5C`