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1、苯甲酸萘1次/30秒1次/30秒时间温度时间温度时间温度时间温度124.652627.19124.662627.19224.702727.19224.712727.19324.712827.19324.722827.19424.722927.20424.722927.20524.733027.20524.733027.20624.743127.20624.743127.20724.753227.20724.743227.20824.763327.20824.753327.20924.763427.20924.753427.201024.763527.201024.753527.201124.8
2、03627.201124.783627.201224.893727.191225.133727.191325.003827.191325.803827.191425.153927.191426.183927.191525.354027.191526.594027.191625.504127.191626.784127.191725.614227.181726.894227.181825.704327.181826.984327.181925.754427.181927.044427.182025.784527.182027.084527.182125.794627.172127.114627.
3、172225.794727.172227.134727.172325.804827.172327.154827.172427.174927.172427.174927.172527.185027.162527.185027.16整理为word格式整理为word格式类似处理方法 计算卡计的热容C,并求出两次实验所得水当量的平均值。苯甲酸的燃烧反应方程式为:根据基尔霍夫定律:Cp,m 7Cp,m(CO2,g)3Cp,m(H2O,l)Cp,m(苯甲酸,s)Cp,m(O2,g)154.6805 J/molK 当室温为26.0 时苯甲酸的燃烧焓为:cHm(26.0)cHm(25.0)+CpT -3226
4、.9154.6805(26.0-25.0)10-3 -3225.84 kJ/mol则:苯甲酸的恒容摩尔燃烧热为:QV cUmcHm RTBVB(g) -3225.848.314299.15(77.5) 10-3 -3224.6 kJ/mol又:nQV-CT -QV点火线m点火线()苯甲酸燃烧的数据处理:QV点火丝m点火丝 -6694.410-33.710-3 -0.02477 kJ15.517 kJ/()苯甲酸燃烧的数据处理:QV点火丝m点火丝 -6694.410-3910-4 -6.02510-3 kJ15.866 kJ/()两次实验所得水当量的平均值为:=(15.51715.866)215
5、.692 kJ/计算萘的恒容摩尔燃烧热QV,m根据公式:nQV-CT -QV点火线m点火线整理为word格式则:()萘燃烧的数据处理:QV点火丝m点火丝 -6694.410-35.410-3 -0.03615 kJQV,m(-CT -QV点火线m点火线)/n5217.9 kJ/mol()萘燃烧的数据处理:QV点火丝m点火丝 -6694.410-31.710-3 -0.01138 kJQV,m(-CT -QV点火线m点火线)/n5178 kJ/mol()萘的恒容摩尔燃烧热平均值为(5217.95178) 25197.5 kJ/mol求萘的恒压摩尔燃烧热Qp,m(即cHm)萘燃烧的化学方程式为:
6、,根据基尔霍夫定律:Cp,m 10Cp,m(CO2,g)4Cp,m(H2O,l)Cp,m(萘,s)12Cp,m(O2,g)154.304 J/molK26.0 时萘的燃烧焓为:cHm (26.0)cUm RTBVB(g) 5206.638.314299.15(2)10-3 5211.604 kJ/mol由基尔霍夫定律将cHm (T)换成cHm (298.15K),并与文献比较cHm(25.0)cHm(26.0)CpT 5211.604154.304(25.026.0) 10-3 5211.758 kJ/mol 相对误差:=1.12% 友情提示:本资料代表个人观点,如有帮助请下载,谢谢您的浏览! 整理为word格式