What is enthelpy for combustion of glucose?

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Discussion Overview

The discussion centers around calculating the enthalpy change for the combustion of glucose, exploring the relevant thermodynamic principles and potential methods for the calculation. The context includes aspects of chemistry and thermodynamics at a second-year physics level.

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • One participant provides the enthalpies of formation for glucose, carbon dioxide, and water, indicating a starting point for the calculation.
  • Another participant introduces Hess's law as a potentially relevant concept for the calculation of enthalpy changes.
  • A participant expresses confusion about the chemistry involved and questions whether the problem is purely thermodynamic in nature.
  • One participant suggests that the inquiry should be directed to a homework forum, implying that a solution attempt is necessary for further discussion.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to the problem, and there is disagreement regarding the appropriateness of the forum for the question.

Contextual Notes

The discussion lacks a detailed exploration of Hess's law and its application, as well as any specific attempts at solving the problem, which may limit the depth of understanding for participants.

i_hate_math
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The enthalpies of formation with reference to (2) are: ∆(Glucose)= −1,268 /, ∆(Carbon Dioxide)= −393.5 ./, ∆(water)= −285.8 /.

How do I calculate the enthalpy for the combustion of 1 mole of glucose?

I know H = U + PV and ∆H = Q + Wother, but I am confused by all the chemistry involved!
 
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Have you heard of Hess's law?
 
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No I haven't. This was a question in a past exam that I'm stuck on, it could be unrelated. Was I right to consider it as a purely thermodynamic (2nd year physics level) problem?
 
This should be posted in a homework forum with an attempt at a solution.

Thread closed.
 

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