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Data: Ecell measured at 21 °C is + 0.7 V Ecell measured at 75 °C is...

Data: Ecell measured at 21 °C is + 0.7 V Ecell measured at 75 °C is + 0.777 V (1) How do calculate ∆G (2) How to calculate the ∆S from slope of ∆G vs Temp (kelvin)? (3) How to calculate ∆H?

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Answer #1

dG = Gfinal - Ginitial

dGfinal = -nFE°cell 2

dGinitial= -nFE°cell 1

Overall change:

dG = -n*F*(E°cell 2 - E°cell 1)

assume 1 electron transferred:

dG = -1*96500*(0.777-0.70) = -7430.5 J/mol

b)

dS from slope in

dG vs T

Slope = 1.108

S = m*R = 1.108*8.314 = 9.21 J/molK

c)

you can always calculate dH as follows:

dG = dH - T*dS

-67550 = dH - 298*9.21

dH = -67550 +298*9.21

dH = -64805.42 J/mol = 64.80 kJ/mol

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