实验一、燃烧热的测定实验数据处理示例

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()21.382 21.385 21.388 21.391 21.394 21.397 21.420 21.835 22.523 23.217 23.714 时间(min)6.06.57.07.58.08.59.09.510.010.511.0温度()23.785 23.831 23.866 23.898 23.924 23.951 23.972 23.991 24.009 24.014 24.017

2、样品（苯甲酸）质量m=0.8562g；其燃烧值为：26460 J/g0.8562g=22655.05J作图如下：由图可得:DT=23.71421.430 =2.284, l Ql0， nQVl Ql = c T C =n QV /T计算得：量热计热容为c=（22655.05 J）/2.284 = 9919.02 J/K。（二）蔗糖燃烧热的测定实验数据如下：时间(min)0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 温度()20.736 20.744 20.752 20.756 20.760 20.764 20.982 21.732 22.232 22.

3、447 22.533 时间(min)6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 温度()22.607 22.654 22.686 22.712 22.724 22.728 22.731 22.733 22.735 22.737 22.739 萘的质量为：m = 1.1302 g图如下： 测得：DT=1.886 K； c = 9919.02 J/K 蔗糖M=342 g/mol计算得萘的燃烧热为：（W样/M样）QV = C量T QV =（C量T）（M样/ W样）= .9 J/mol = 5660.8 kJ/mol(三)结果讨论与分析实验结果偏大,可

4、能是忽略了铁丝的燃烧值引起的。实验数据处理示例2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19.8820.6922.1719.9821.0322.1820.2821.3222.1920.3021.5422.2020.3121.7022.2220.3221.8322.2020.3421.9822.1920.3622.0722.1820.3822.1022.1620.3922.1522.15质量(g)燃烧丝长度(cm)DT()苯甲酸0.83278.52.63萘0