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In photosynthesis, green plants convert carbon dioxide and water into glucose (C6H12O6) according to the following...

In photosynthesis, green plants convert carbon dioxide and water into glucose (C6H12O6) according to the following equation: 6CO2(g)+6H2O(l)→ C6H12O6(aq)+6O2(g). Estimate ΔH for the reaction using bond dissociation energies from Table 7.1. Give your answer in kcal/mol and kJ/mol. C6H12O6 has five C−C bonds, seven C−H bonds, seven C−O bonds, and five O−H bonds. Express your answers as integers separated by a comma.

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Expert Solution

6CO2(g)+6H2O(l)→ C6H12O6(aq)+6O2(g)

ΔH    = bond energy of reactasnts - bond energy of products

        = 6(O=C= O) + 6(H-O-H) - [ (5(C-C) + 7(C-H) + 7(C-O) + 5(O-H) + 6(O=O) ]

        = 12(C=O) + 12(O-H) - [ (5(C-C) + 7(C-H) + 7(C-O) + 5(O-H) + 6(O=O) ]

         = 12*799 + 12*467 - ( 5*347+ 7*413 + 7*358 + 5*467+ 6*495)   

         = 15192 - 12437   = 2755KJ

C6H12O6 has five C−C bonds, seven C−H bonds, seven C−O bonds, and five O−H bonds. = 1735 Kj, 2891Kj , 2506KJ, 2335KJ

queen_honey_blossom answered 2 years ago
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