Calculate the standard cell potential of the galvanic cell in which the following reaction takes place:
`2Cr(s)+3Cd^(2+)(aq)to2Cr^(3+)(aq)+3Cd(s)`
Also calcuate the `triangle_(r)G^(ɵ)` value of the reaction
(given `E_(cr^(3+)//Cr)^(ɵ)=-0.74V,E_(Cd^(3+)//Cd)^(ɵ)=-0.40V` and `F=96500Cmol^(-1)`