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Burning hydrogen

Page history last edited by Joe Redish 5 years, 4 months ago

6.4.P20

 

The chemical reaction for the burning of hydrogen is 2H2O ↔ 2H2 + O2. The molecular structures are schematically represented by the figure at the right. 

 

The bond energies for a single molecule are as follow:

  • O-H bond: 4.52 eV
  • O-O (double) bond: 5.17 eV
  • H-H bond: 4.77 eV. 
  

 

A. In which direction does the reaction require a net energy input?

  1. 2H2O → 2H2 + O2
  2. 2H2O ← 2H2 + O2
  3. 2H2O ↔ 2H2 + O2 (both directions)
  4. Neither.

 

B. How much energy input is required?

 

C. Given that we choose separated atoms at rest as our zero of potential energy, which of the following bar charts gives a reasonable representation of how energy is balanced in the reaction? If none work, choose N.

 

 

Joe Redish 12/10/15

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