Question

Question are as shown. no additional information was given... 1. Determine the value of the standard...

Question are as shown. no additional information was given...

1. Determine the value of the standard free energy, ΔGo, in kJ/mol at 25oC for the reaction: Na+(aq) + 2Br -(aq)   →   Na(s) + Br2(g)

ΔGo = ?

2. Determine the value of the standard free energy, ΔGo, in kJ/mol at 25oC for the reaction: Al3+(aq) + Ca(s)   →   Al(s) + Ca2+(aq)

ΔGo = ?

Homework Answers

Answer #1

Hi,

1. 2Na+(aq) + 2Br -(aq)   → 2Na(s) + Br2(g) (balanced reaction)

oxidation, 2Br -(aq) + 2e Br2(g) E1 (reduction potential)= +1.066 V

Reduction,2Na+(aq) + 2e   2Na(s) E2 (reduction potential)= -2.714 V

Eocell= E1-E2= (-2.714)- 1.066 = -3.78 V

ΔGo = -nFEocell

ΔGo= -2*96500*( -3.78 )= 729540 J= 729.540 kJ, which means reaction is not feasiable.

The next problem can similarly be solved by using the following data.

Al3+(aq) + 3 e   Al(s) -1.66

Ca2+(aq) + 2 e   Ca(s) -2.87

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