Question

In: Chemistry

#1. Estimate ΔH for the reaction using bond dissociation energies. Give your answer in kcal. C6H12O6...

#1. Estimate ΔH for the reaction using bond dissociation energies. Give your answer in kcal. C6H12O6 has five C−C bonds, seven C−H bonds, seven C−O bonds, and five O−H bonds.

#2. Is the reaction exothermic or endothermic?

#3. The following equation shows the conversion of aluminum oxide (from the ore bauxite) to aluminum:
2Al2O3(s)→4Al(s)+3O2(g),  
ΔH = +801.0 kcal

----> a. Is the reaction exothermic or endothermic?

Solutions

Expert Solution

#1 Let us first make a simple table,

Bond type   No. of bond    Bond energy(kJ/mol)   total bond energy(kJ/mol)   

C-C                 5                       347                                 1735                             

  O-H                 5                       464                                 2320

  C-H                 7                       414                                 2898

C-O                 5                       358                                 1790

C=O                 1                       803                                  803

----------------------------------------------------------------------------------

Total Bond Energy for Glucose = 9546 kJ/mol = 2281.55 kcal/mol

#3 The given reaction is endothermic. deltaH is +ve, means heat is taken up by the reaction.


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