[Frederick95]

Quantity    Measurement
Mass of water                              100.0 g
Specific heat capacity of aluminum    0.91 J/goC
Mass of aluminum can                 50.0 g
Initial temperature of calorimeter    20.0oC
Final temperature of calorimeter    25.0oC
Mass of acetone burned                 0.092 g

Question: Calculate the molar enthalpy of combustion of acetone, using the experimental evidence.


This is all the work I did for this question.
Please help me finish it off it would be greatly appreciated.

           Given:
           Mass (m) of water: 100.0 g
           Specific heat capacity(c) of aluminum: 0.91 J/ goC
           Mass (m) of aluminum can: 50.0 g
           Initial temperature (Ti) of calorimeter: 20.0 oC
           Final temperature(Tf) of calorimeter: 25.0 oC
           Mass (m) of acetone burned: 0.092 g
           
           Required:
     Molar enthalpy of combustion of acetone?

     Analysis??
          ΔT = tf - ti
          = 25.0 oC - 20.0 oC
          = 5.0 oC

          Q = mc deltaT
       = (100.0 g) (0.91 J/(goC)) (5.0 oC)
       = 455 J
        H = - Q = - 455 J = -0.455 kJ
     Number of moles (n) = (given mass (g))/(gram-formula mass)
                                    =
      H/n = -0.455 kJ /      mole =        kJ/mole of C3H6O =

[Borek]

http://www.chemicalforums.com/index.php?topic=23750

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