实验一、燃烧热的测定实验数据处理示例

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1、实验一、燃烧热的测定(氧弹法)实验数据处理示例实验数据处理示例1（一）量热计热容(水当量)的测定实验数据如下：时间(min)0.51.01.52.02.53.03.54.04.55.05.5温度(℃)21.38221.38521.38821.39121.39421.39721.42021.83522.52323.21723.714时间(min)6.06.57.07.58.08.59.09.510.010.511.0温度(℃)23.78523.83123.86623.89823.92423.95123.97223.99124.00924.01424.017样品（苯甲酸）质

2、量m=0.8562g；其燃烧值为：－26460J/g×0.8562g=－22655.05J作图如下：由图可得:DT=23.714－21.430=2.284,∵lQl≈0，∴－nQV－lQl=cΔTC=－nQV/ΔT计算得：量热计热容为c=（22655.05J）/2.284=9919.02J/K。（二）蔗糖燃烧热的测定实验数据如下：时间(min)0.51.01.52.02.53.03.54.04.55.05.5温度(℃)20.73620.74420.75220.75620.76020.76420.98221.73222.23222.44722.533时间(min)6.06

3、.57.07.58.08.59.09.510.010.511.0温度(℃)22.60722.65422.68622.71222.72422.72822.73122.73322.73522.73722.739第4页共4页萘的质量为：m=1.1302g图如下：测得：DT=1.886K；c=9919.02J/K蔗糖M=342g/mol计算得萘的燃烧热为：－（W样/M样）QV=C量×ΔTQV=－（C量×ΔT）×（M样/W样）=－5660844.9J/mol=－5660.8kJ/mol(三)结果讨论与分析实验结果偏大,可能是忽略了铁丝的燃烧值引起的。第4页共4页实验数据处理示例2

4、实验数据：点火前的温度(每隔1min)点火过程中的温度(每隔15s)点火后的温度每隔1min)苯甲酸18.1218.2219.9418.1218.5419.9618.1318.8819.9818.1419.1719.9918.1519.3720.0018.1619.5320.0018.1719.6319.9918.1719.7219.9818.1819.8219.9818.1919.9019.97萘19.8820.6922.1719.9821.0322.1820.2821.3222.1920.3021.5422.2020.3121.7022.2220.3221.8322

5、.2020.3421.9822.1920.3622.0722.1820.3822.1022.1620.3922.1522.15第4页共4页质量(g)燃烧丝长度(cm)DT(℃)苯甲酸0.83278.52.63萘0.47944.652.02由苯甲酸燃烧计算出热量计的水的总当量：8386.78再由图2可以计算出萘的恒容燃烧热为：35310.42J/g，第4页共4页