Compound Cerium

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February 9th, 2008 admin

Compound Cerium
Free energy and redox reactions/ Bond Orders?

Hi there, I’m stuck on a few questions for chemistry/thermodynamics and i have no idea how to do them.. so if you could explain how to do it that would be very much appareciated!

1. Write a balanced equation for the oxidation of iron(III) Sulphate by cerium (IV) sulphate. Calculate dG’ for your reaction.
Ce4+/ Ce3+ = 1.61 V
Fe3+/Fe2+ = 0.77 V
F = 96 500

2. On the basis of a simple molecular orbital model, write down the ground state configuration of the O2 2- ion and calculate it’s bond order. Show whether it’s diamagnetic or paramagnetic.

i have no idea how to tell what is antibonding or bonding.. i know the equation is 1/2 (bonding – antibonding) but how do you tell which e- are in the bonding/antibonding orbital.

Also, another thing is when a question asks you what resolution of mass spectrometer to use to distiguish between two similiar compounds.. what do you write?

Thanks!

Fe3+ + Ce4+ –> Hello???

Both of these are as oxidized as they are going to get. Perhaps you mean the oxidation of Fe2+?

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O2^2- will have a bond order of 1 and no unpaired electrons, hence it is diamagnetic.

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Resolution, R, is the ratio of the mass of the ion to the smallest difference between two adjacent peaks, Dm
R = m / Dm

If R = 100 then one mass must be at least 1% smaller or larger than the other. The greater the value of R the better the resolution. An R of 1000 means there is only 0.1% difference in masses.