Sucrose standard enthalpy

The standard enthalpies of formation and combustion of D-ribose and D-ribono-1,4-lactone have been determined by calorimetric combustion in air. Differential scanning calorimetry on an aqueous sucrose soluticm revealed two glass transitions, at -63 °C and -43 °C, upon cooling and warming, respectively, the bulk of the water freezing at -18... 

Glucose and fructose (Atlas S3) are simple carbohydrates with the molecular formula C6H12O6. Sucrose (Atlas S5), or table sugar, is a complex carbohydrate with molecular formula CijHjjOn that consists of a glucose unit covalently linked to a fructose unit (a water molecule is released as a result of the reaction between glucose and fructose to form sucrose). Estimate the standard enthalpy of combustion of sucrose from the standard enthalpies of formation of the reactants and products. 

Inspection of the chemiccd equation shows that, in this instance, the per mole is per mole of sucrose, which is exactly what we need for an enthalpy of combustion. It follows that the estimate for the standard enthalpy of combustion of sucrose is -5644 kJ moh. The experimental value is -5645 kJ mol". ... 

A standard molar enthalpy of formation can be defined for a solute in solution to use in Eq. 11.3.3. For instance, the formation reaction of aqueous sucrose is... 

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