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本文报道对二甲氧基苯的燃烧热和升华热的测定及其固态和气态下标准生成焓的计算。实验仪器和实验燃烧热和升华热分别用本实验室建立的精密转动弹量热计和升华热量热计测定。测定燃烧热用的计温元件是HP2804A石英频率温度计。石英频率温度计的分辨率为0.0001℃,它直接与PET 2001系列的计算机和HP 9876A型打印机相联接,使实验温度观测实现了自动显示和打印。由于燃烧样品是含碳、氢、氧的化合物,所以弹内加1mL水。氧弹也不转动
This paper reports the determination of the heat of combustion and the sublimation of p-dimethoxybenzene and the calculation of the standard enthalpies of formation in solid and gaseous phases. Experimental equipment and experimental combustion heat and sublimation heat were established using the laboratory precision rotating calorimeter and sublimation calorimeter. The temperature measurement element used to determine the heat of combustion is the HP2804A quartz frequency thermometer. The quartz frequency thermometer has a resolution of 0.0001 ° C and is connected directly to the PET 2001 series of computers and the HP 9876A printer for automatic display and printing of experimental temperature observations. Since the combustion sample is a compound containing carbon, hydrogen, and oxygen, add 1 mL of water to the bomb. Oxygen bomb does not rotate