A fuel cell has the reactions

Anode: 2A2 = 4 A++ + 8 e-

Cathode: 4 A++ + B2 + 8e- = 2 A2B

All data are at RTP. (RTP = Room Temperature Pressure, 25 C and 1atm)

The overall reaction 2 A2 + B2 = 2A2B, releases 300 MJ per kmole of A2B product in a calorimeter. The entropies of the different substances are:

A2: 200 kJ K-1 kmole-1

B2: 400 kJ K-1 kmole-1

A2B: 150 kJ K-1 kmole-1

A2 and B2 are gases, whereas A2B is liquid.

a) What is the voltage of an ideal fuel cell that uses the above reaction at RTP?

b) Estimate the voltage at standard pressure and 50 C.

c) How much heat does the ideal fuel cell produce per kilomole of A2B, at RTP?

d) What is the voltage of the cell if the gases are delivered to it at 100 MPa? The operating temperature is 25 C.