The reactions that take place in the hydrogen fuel cell are shown below. If the

Question

The reactions that take place in the hydrogen fuel cell are shown below. If the cell voltage for a H2 fuel cell is 1.24 V, what is the maximum work that can be obtained using this fuel cell when 1.0 mol of O2(g) is consumed?

Anode:       2H2(g) + 4OH?(aq) ? 4H2O(?) + 4e?

Cathode:     O2(g) + 2H2O(?) + 4e? ? 4OH?(aq)

Overall:      2H2(g) + O2(g) ? 2H2O(?)

A) 650 kJ
B) 479 kJ
C) 515 kJ
D) 425 kJ
E) 320 kJ

Which one of the following metals can provide cathodic protection to a lead pipe? (You can use the cell potentials on your data sheet.)

Which one of the following metals can provide cathodic protection to a lead pipe? (You can use the cell potentials on your data sheet.)

Explanation / Answer

Answer: Option: B) 479 KJ

Work done (W) = -nFE

Given n (number of electrons involved in transfer) = 4

E = 1.24 V

F= 96500 coulombs

W= -(4*1.24*96500)

= -478640 joules

Work done (W)= -478.64 Kilo joules = 479 kJoules

Option D): Au

Gold is suitable metal for cathodic protection of lead.

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