October 6, 2015

Homework Help: Chemistrey

Posted by Calorimeter on Wednesday, April 4, 2007 at 6:54pm.

Lab exercise 10C Calibrating bomb Calorimeter
Before Molar specific enthalpies of reaction can be determined, a bomb calorimeter must be calibrated using primary standard of precisely known molar enthalpy. Complete the analysis of the investigation report.
What is the heat capacity of the newly assembled oxygen bomb calorimeter?
Experimental design:
An oxygen calorimeter is assembled and several samples of the primary standard, benzoic acid are burned using a constant pressure of excess oxygen. The evidence that is collected determines the heat capacity of the calorimeter for the future experiments.
In the CRC Handbook of chemistry and physics, the molar enthalpy of combustion for benzoic acid is reported as
Hc= -3231 kJ/ mol

Calorimetric Evidence for the burning of Benzoic Acid

Mass of C6H5COOH (s) (g)
Trial 1: 1.024
Trial 2:1.043
Trial 3:1.035

Initial temperature (C)

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