How would I answer this chemistry question?

Explain the reason for this result by comparing what is involved in changing Fe2+ to Fe3+ to what is involved in changing C2O4 2-(oxalate) to 2CO2

the question refers to the previous question but hopefully you can still answer it without the other question.
I have one more question:
Explain why blowing on a smoldering fire may make it burn better.
 
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