[xtheunknown0]

Hello,

How do you disprove choice B for question 16 of http://www.vcaa.vic.edu.au/vcaa/vce/studies/chemistry/exams/2009/2009chem2-w.pdf
?

TIA,
xtheunknown0

[fledarmus]

1) What are the gaseous products of the fuel cell reaction? (it might help to write out the chemical reaction that is occurring here)

2) What would happen to your chemical reaction if those products were recycled into the fuel cell?

[xtheunknown0]

1) CO2(g)
2) Would it slow down the rate of the forward reaction?

[fledarmus]

2) Would it slow down the rate of the forward reaction?

You write that as if it were a guess!    Good one though...

http://en.wikipedia.org/wiki/Le_chatelier%27s_principle

[SABRY]

1. Fuel cells produce CO2?

2. Please review back the chemical reaction involved

[fledarmus]

This is a methanol fuel cell, not a hydrogen fuel cell. The reactions were provided as part of the question:

A fuel cell can be constructed that uses the following two half-reactions.
CO2(g) + 6H+(aq) + 6e– CH3OH(aq) + H2O(l) Eo = + 0.05 V
O2(g) + 4H+(aq) + 4e– 2H2O(l) Eo = +1.23 V

[xtheunknown0]

2) Would it slow down the rate of the forward reaction?

You write that as if it were a guess!    Good one though...

Thanks for your input