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A sample of the sugar D-ribose (C5H10O5) of mass 0.727g was placed in calorimeter and then...

A sample of the sugar D-ribose (C5H10O5) of mass 0.727g was placed in calorimeter and then ignited in the presence of excess oxygen. The temperature rose by 0.910K. In a separate experiment in the same calorimeter, the combustion of 0.917g of benzoic acid (C7H6O2), for which the internal energy of combustion is -3226kJ/mol, gave a temperature rise of 1.940K. Calculate the enthalpy of formation of D-ribose. Here, the enthalpies of formation of CO2(g) and H2O(l) are -393.51kJ/mol and -285.83kJ/mol, respectively.
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