Calculate the oxidation number of carbon

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    Carbon Oxidation
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Discussion Overview

The discussion revolves around calculating the oxidation number of carbon in the products of two different reactions involving glucose and evaluating the advantages and disadvantages of these fermentation processes as fuel sources. The scope includes theoretical calculations and conceptual analysis related to energy release and product separation.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant calculates the oxidation state of carbon in the products of the first reaction as +4.
  • Another participant notes that a disadvantage of the first reaction is the production of CO2, which is a byproduct of glucose breakdown.
  • A participant points out that the first reaction produces a mixture of gases that must be separated, while the second reaction's products are dissolved and require distillation for purification.
  • There is a suggestion that the energy released in the first reaction may not be available for power production if it is wasted in the fuel production process.
  • One participant speculates that if a process liberates more energy, less energy may be liberated upon the oxidation of the fuel.
  • Another participant proposes that separating methane from CO2 might be easier than distilling ethanol from the broth.

Areas of Agreement / Disagreement

Participants express differing views on the advantages and disadvantages of the two fermentation processes, particularly regarding energy release and product separation. There is no consensus on the best approach or the implications of energy liberation.

Contextual Notes

Some assumptions about the ease of separation processes and the implications of energy release are not fully explored. The discussion does not resolve the complexities of energy availability in relation to the oxidation of the fuels produced.

Kushal
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Homework Statement



C6H12O6\rightarrow 3CO2 + 3CH4 \DeltaH = -132 kJmol-1


C6H12O6\rightarrow 2CO2 + 2C2H5OH \DeltaH = -68 kJmol-1

1. Calculate the oxidation number of carbon in each of the products of the first reaction.

2. Comment on the relative advantages and disadvantages of these 2 types of fermentation as sources of fuel from glucose.


Homework Equations





The Attempt at a Solution



1. i found carbon to be at an oxidation state of +4 in the products of the first reaction.

2. the first reaction releases more energy than the second one. it is more exothermic.

the second part contains 3 marks, so i think i need 2 more points, but i can't find anything more.

thanks
 
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Well I guess a disadvantage would be the production of CO2 everytime you break down glucose. So while it does release more energy it releases more CO2 as well.
 
Your first answer is incomplete. There are two products...


In the first reaction, you have a mixture of two gases and you will have to separate them unless you want to use the methane contaminated with CO2. In the second reaction, the products are dissolved in the broth (beer?) and must be distilled to be purified. Which process do you think is easier?

What advantage/disadvantage is there for a process that liberates more energy in the production of one of these fuels? Is that energy available for power production or is it wasted in the production of the fuel?
 
i think that if the process producing the fuel liberates more energy, then on oxidation of the fuel, less energy will be liberated.

and, i think it is easier to separate the methane from CO2 (maybe cooling the mixture to make the CO2 solidify?!) than taking the ethanol out of the broth.

i had in mind that it was that energy released from the above reactions that were used, and not the energy from the further oxidation of methane or ethanol. :-S

but what you say makes much more sense. thnks
 

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