Shenzhen University Physical Chemistry Experiment Report

Shenzhen University Physical Chemistry Experiment Report

Experimenter: Xie Jiaxuan Su Zhu Experimental Time: 2000/3/5

Temperature: 24.5 °C Atmospheric pressure: 101.47 kPa

Determination of heat of combustion

Purpose requirement

First, the heat of combustion of naphthalene is measured by an oxygen bomb calorimeter

Second, to define the definition of combustion heat, to understand the difference between constant pressure combustion heat and constant volume combustion heat

Third, understand the role of the main part of the calorimeter, master the experimental technology of the oxygen bomb calorimeter

Fourth, learn the Reynolds graphic method to correct the temperature change value

Instruments and reagents

Oxygen bomb card meter Beckman thermometer ordinary thermometer tablet analyzer analysis platform scale universal meter ignition wire scissors ruler tweezers wrench benzoic acid diesel oxygen cylinder oxygen pressure reducing valve

Experimental data and its processing

4 Experimental Discussion Why should a solid sample be pressed into a sheet?

A: It is easy to burn when pressed into a sheet, it is in full contact with oxygen, and it is easy to weigh.

2. In the calorimetric measurement, what other conditions may require the use of the Reynolds temperature correction method?

A: Any temperature difference correction can be used in the experiment.

3. How to use the combustion data of naphthalene to calculate the standard heat of formation of naphthalene?

A: Substitute the formula calculation.