Problem: The heat of combustion of fructose, C6 H12 O6, is -2812 kJ/mol.If a fresh golden delicious apple weighing 4.26 oz (121 g ) contains 17.0 g of fructose, what caloric content does the fructose contribute to the apple?

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We’re being asked to determine the caloric content fructose contributes to the apple.


The caloric content of food is determined from its enthalpy of combustion per gram, as measured in a bomb calorimeter.


The ΔHcomb described in joules (or kilojoules) are negative for all substances that can be burned. In contrast, the caloric content of a food is always expressed as a positive number because it is stored energy. So,


caloric content = - Hcomb


We will solve the problem by converting the enthalpy of combustion to calorie and determine the contribution of the fructose. 

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Problem Details

The heat of combustion of fructose, C6 H12 O6, is -2812 kJ/mol.

If a fresh golden delicious apple weighing 4.26 oz (121 g ) contains 17.0 g of fructose, what caloric content does the fructose contribute to the apple?

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