QUESTION 3 A fuel cell designed to react grain alcohol with oxygen has the following net...

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science chemistry

Answer 1

Answer #1

Sol :-

Net reaction is given :

C2H5OH (l) + 3O2 (g) ---------------> 2CO2 (g) + 3H2O (l)

Oxidation half cell reaction is :

C2H5OH (l) + 3H2O (l) -------------------> 2CO2 (g) + 12H+ (aq) + 12e-

Reduction half cell reaction is :

3O2 (g) + 12H+ (aq) + 12e- -------------------> 6H2O (l)

Number of electron exchange (n) in this redox reaction is = 12

The relationship between ΔG and Ecell is :

ΔG = -nFEcell

F= Farady constant = 96500 C

So,

- 1320 x 103 J = - 12 x 96500 C x Ecell

Ecell = - 1320 x 103 J / - 12 x 96500 C

= 1.14 V

Hence, Potential of the cell = Ecell = 1.14 V

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Answer 2

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