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July 31, 2015

Homework Help: Chemistrey

Posted by Calorimeter on Wednesday, April 4, 2007 at 6:55pm.

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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