Guangzhou Chemical Industry

摘要

燃烧焓测定是物理化学教学中基本实验之一。日常教学中发现,学生实验时对测定条件的选择依据不清楚,也不清楚这些条件对测定的影响大小。因此测定结果往往存在较大的偏差。为此,我们使用三因素四变量正交表L16(43),研究了萘质量、压片压力和氧弹充气压力等因素对燃烧焓的测定的影响。研究发现,因素中影响最大的是氧弹充氧压力,而萘质量、压片压力对测定的影响不大；最佳测定条件是萘质量0.6 g,压片压力1.0 MPα,充氧压力4.0 MPα。%Enthalpy of combustion was determined by oxygen-bomb calorimeter adiabatically and their experimental factors including the mass of naphthalene, the pressure of preparingand oxygen pressure in oxygen-bomb were studied. It was found that the oxygen pressure in the bomb was the key for the measurement of naphthalene enthalpy, the optimized experimental conditions were 0. 6 g of naphthalene, 1. 0 MPa for pressing the sample and 4. 0 MPa for the oxygen pressure.