1.

The temperature dependence of the e.m.f. of a standard electrochemical cell is given by E=1.02-4.0xx10^(-5)(T-20)-9.0xx10^(-7)(T-20)^(2) where T is in .^(C) and E is in volts. Calculate the temperate coefficiency of the e.m.f. at 30^(@)C

Answer»

SOLUTION :`(DE)/(DT)=(d)/(dT)[1.02-4.0xx10^(-5)(T-20)-8.0xx10^(-7)(T-20)^(2)]`
`=-0.4xx10^(-5)-9.0xx10^(-7)xx2(T-20)`
`=-4.0xx10^(-5)-9.0xx10^(-7)xx2(30-20)`
`=-4.0xx10^(-5)-9.0xx10^(-7)xx20`
`=-4.0xx10^(-5)-1.80xx10^(-5)=-5.8xx10^(-5)V//.^(@)C`


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