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In order to evaluate the thermodynamics of the system, we need to know the enthalpy of combustion for octane. To calibrate a bomb calorimeter, 0.9136 g of benzoic acid was ignited under 25 atmospheres of pure oxygen initially at 25.352 °C. A temperature rise of 2.384 °C was observed. 1.0432 g of octane was then ignited in the same bomb calorimeter. Unfortunately, the student making this measurement made a mistake and used, only on this second experiment, a miscalibrated balance to determine the appropriate amount of water to be placed in the water bath of the bomb calorimeter. After carefully checking the calibration of the balance, the student determined that the second experiment had 3.0824 g too little water. In that experiment, the observed temperature rise from the same initial temperature was 4.930 °C. Find the enthalpy of combustion for octane at 298 K.



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