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If Kc for the reaction Cu^(2+)(aq)+Sn^...

If `K_c` for the reaction
`Cu^(2+)(aq)+Sn^(2+)(aq)toSn^(4+)(aq)+Cu(s)`
at `25^(@)` C is represented as `2.6xx10^y` then find the value of y.
(Given:`E_(Cu^(2+)"|"Cu)^(@)=0.34V,E_(Sn^(4+)"|"Sn^(2+))^(@)=0.15V)`

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