Question

The standard rectuion potentials for two half-cell reactions are given below
`Cd^(2+)(aq)+2e^(-)rarrCd(s),E^(@)=-0.40V`
`Ag^(+)(aq)+e^(-)rarrAg(s),E^(@)=0.80V`
The standard free energy change for the reaction
`2Ag^(+)(aq)+Cd(s)rarr2Ag(s)+Cd^(2+)(aq)` is given by
A. 115.8kJ
B. `-115.8kJ`
C. `-231.6kJ`
D. `231.6kJ`

Answer 1

Correct Answer - C
` 2Ag^(+)(aq)+2e^(-)rarr2Ag(s) :E^(@)= 0.80V`
`Cd(s)rarrCd^(2+)(aq)+2e^(-):E^(@)=0.400`
`2Ag^(+)(aq)+Cd(s)rarrCd^(2+)(aq)+2Ag(s)`
`E^(@)=1.20V`
`DeltaG=-nE^(@)F`
`=-2xx1 .20xx96500`
`=-231.6kJ`