A 0.1964 g sample of quinone(C 6 H 4 O 2 ) is burned in a bombcalorimeter that h

Question

A 0.1964 g sample of quinone(C6H4O2) is burned in a bombcalorimeter that has a heat capacity of 1.56 kJ/°C. Thetemperature of the calorimeter increases by 3.2°C. Calculatethe energy of combustion of quinone per gram and per mole.
                  kJ/g
                   kJ/mol
help!! thanks!!
A 0.1964 g sample of quinone(C6H4O2) is burned in a bombcalorimeter that has a heat capacity of 1.56 kJ/°C. Thetemperature of the calorimeter increases by 3.2°C. Calculatethe energy of combustion of quinone per gram and per mole.
                  kJ/g
                   kJ/mol
help!! thanks!!

Explanation / Answer

First calculate the heat transfered from the burned quinone tothe calorimeter. Qrxn = CT Qrxn = (1.56 kJ/°C) (3.2°C) = 4.992 kJ Then, Ecombustion = 4.992 kJ / 0.1964 g = 25.417 kJ/g . . The molar mass of quinone is 108 g/mol, so . Ecombustion = 4.992 kJ/ [0.1964 g/ (108 g/mol)] =4.992kJ/ 1.8185x10-3 mol = 2745.09 kJ/mol

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