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The standard enthalpies of formation of CO₂(g), H₂O(l) and glucose(s) at 25°C are -400 kJ/mol, -300 kJ/mol and -1300 kJ/mol, respectively. The standard enthalpy of combustion per gram of glucose at 25°C is -

1. +2900 kJ
2. -2900 kJ
3. -16.11 kJ
4. +16.11 J

Correct answer: -16.11 kJ

Solution

The enthalpy of combustion is calculated using the standard enthalpy of formation values. Dividing the total enthalpy change by the molar mass of glucose gives -16.11 kJ per gram.

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