Q.

For the reaction: 

2Fe3+aq+2Iaq2Fe2+aq+I2s

The magnitude of the standard molar free energy change, 

ΔrGm°= _________________ kJ ( Round off to the Nearest Integer).

EFe2+/Fe(s)=0.440V; EFe3+/Fe(s)=0.036V;EI2/2I=0.539V; F=96500 C

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answer is 45.

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Detailed Solution

Considering the given reaction:

Fe3++3e-Fe; EFe3+/Fe=-0.036 V FeFe2++2e-; EFe/Fe2+=0.440 V Fe3++e-Fe2+, EFe3+/Fe2+=?

ΔG0=nFEcell0GFe3+/Fe2+°=GFe3+/Fe°+GFe/Fe2+°EFe3+/Fe2+°=3EFe3+/Fe°+2EFe/Fe2+°1EFe3/Fe+20=(0.036)3(0.44×27)EFe3/Fe+20=0.772V

Ecell° for the given reaction:

Ecell°=EFe3+/Fe2+°+EI-/I2° Ecell°=0.772-0.539=0.233 V

ΔrGm° is calculated as:

rGm°=-nFEcell rGm°=-2×96500×0.233 rGm°=-44969 J=-44.9 kJ-45 kJ

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