Answer to Question #156897 in General Chemistry for Sumon

Question

In a H 2 fuel cell, electricity is produced by oxidation-reduction reaction between

H 2 and O 2 gases. Draw a diagram of H 2 – O 2 fuel cell and write down the cell

reaction of that fuel cell. At STP 89.6 L H 2 gas is passed in H 2 fuel cell which

reacts with O 2 for 20 minutes. What is the average strength of electricity (in

ampere) produced? If total current produced is passed in CuSO 4 solution of

electrolytic cell, then what amount of Cu metal will be deposited at cathode?

Answer 1

O_2​(g)+2H₂​O(l)+ 4e− →4OH^−_(aq).

Mole at STP = Volume/ Molar Volume

=  89.6 L/22.4Mol/L

= 4 mol

1 F = 96,500 C

Q = It

2 = I x (20 x 60)

I = 2/ 1200

= 0.0017A

m = E x I x T / 96500

= 2 x 0.0017 x 20 x 60 /96500

= 4.14 x 10^-5g