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Write the NERNST equation and calculate ...

Write the NERNST equation and calculate e.m.f of following cell at 298 K
`Sn (s)//Sn^(2 +) (0.050 M) // H^(+) (0.020M)// H_2` (1 atm)
Given `E^0 Sn (s)//Sn^(2+)` =-0.14V

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