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July 23, 2014

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.
Problem:
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.
Evidence:
In the CRC Handbook of chemistry and physics, the molar enthalpy of combustion for benzoic acid is reported as
Hc= -3231 kJ/ mol
C6H5COOH


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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