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Compute standard e.m.f. of cell Zn((s)...

Compute standard `e.m.f.` of cell
`Zn_((s))+Co^(2+) rarr Co_((s))+Zn^(2+)`
Given `E_(Zn//Zn^(2+))^(@) = +0.76 V` and `E_(Co//Co^(2+))^(@) = +0.28 V`

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We Know,
`E_(OP_(Zn//Zn^(2+)))^(@) = +0.76V, E_(OP_(Co//Co^(2+)))^(@) = +0.28V`,
`:. E_(RP_(Co^(2+)//Co))^(@) = -0.28V,`
`E_(cell)^(@) = E_(OP_(Zn//Zn^(2+)))^(@)Z+ E_(RP_(Co^(2+)//Co))^(@)`
`= 0.76-0.28`
`E_(cell)^(@) = 0.48 V`
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